大学体验英语第三版课后习题和解答

Unit 1Passage A

Read and complete 4

1 They should be for planning and carrying out the inancial policies of the company

2 No final decision has been taken, but it seems likely that the two companies could merge in the near future

3 The girl was very upset because she could not get these coffee out of the new carpet

4 They said that they would innovate with persistence to the product in the coming year

5 April sunlight over the water, dancing across snow-covered fields

6 I got a free of eye shadow. Could you show me how to use it?

7 It is generally accepted that giving advice at the right time has to a great deal of intelligence

8 Have you found the small symbols on this map which denote places and museums?

9 The freshmen were recommended to read the book which was illed with insights

10 It was the old lady’s eightieth birthday, and she was sitting in a chair by her children and grandchildren

Answer: 1.responsible 2.ultimatel, 3.stains 4.highlight 5.sparkled

6.sample

7.involve

8.historic

9.remarkable 10.surrounded

Read and complete 5

1.Under the inluence of the drug his mind various strange images

2.Some freshmen said that they by that concert.

3. finance, the old company has a great advantage.

4.He that he would never talk with that guy any more.

5.If you the controversy (争论), you may burn your fingers.

Answer: 1.was filled with 2. were blown away 3. In terms of 4. thought to himself 5.get involved in

Read and complete 6

There are some places in this area, which attract tourists every day. (historic // history // historian)

2. They trusted Stephen to behave while they were abroad.(responsible // responsibly // responsibility)

3. That’s the most coincidence (巧合) I’ve ever hea rd of! (incredible // credible // credit )

4.We should get a thorough understanding of the cultural of the United States.(diversity // diverse // diversify

5.To give a of a word is more dificult than to give an illustration (例证) of its use.(deinite // deinitely // deinition)

Answer: 1.historic 2. responsibly 3. incredible 4. diversity 5.defi nition

7 1. 你愿意把你的经验和组里的其他人分享吗？(share sth with sb)

Answer:Would you like to share your experience with the rest of the group?

2. 你父亲如果还健在的话，他会为你骄傲的。(be proud of)

Answer:If your father were still alive, he would be very proud of you.

3. 她开车转弯上了自家的车道(driveway)，不料发现路已被堵塞(block)。(only to)

Answer:She turned up the driveway, only to fi nd her way blocked.

4. 他没有告诉任何人就走了，因为他不想卷入那件事。(get involved in)

Answer:He went away without telling anyone, because he didn’t want to get involved in that matter.

5. 最终，产品的成功还是取决于高明的销售手段(marketing)。(ultimately)

Answer:Ultimately, the success of the product depends on good marketing.

9 1. How to balance study and extracurricular activities at college?.

Tips: A: How do you feel about your college life?

B: It’s !But I also feel because I am always busy with . I

really don’t know how I could manage .

A: Yeah, it is really a （）for a freshman.

B: Can you give me some advice on （）?

A: Well, I think you must learn to be （） .

Other useful words for reference: great, amazing, interesting, exciting,gorgeous, disappointed, sad, homesick, tired, occupied, full schedule, exhausted,difficult, clubs, sports team, associations, musical groups,theater production.

2. How to make a study plan?

Tips: A: You must learn to be organized and disciplined. I think it’s （）for you to （） .

B: Oh! That’s （） . But I don’t know how to （） .

A: As I know, there are （） .

B: Could you explain it in detail?

A: Sure. First, （）. Second, （）. List the courses that you must take to satisfy your degree or diploma requirements. Third, （）. That involves keeping a weekly study schedule that （） . Fourth, （） . Last but not least, （） .

Other useful words for reference: education goal, long term plan, college objectives, satisfy degree requirements, individual course, organize time, weekly study schedule, make good use of, check your plan, fall short of accepted standards, make up

3. What is a good study plan?

Tips: A: What is a （）plan like?

B: A good study plan should be simple, speciic, possible, and written.

A: Can you give me （）?

B: OK. When you have yours committed to paper, it should meet the following criteria: Simple — never complicated.

Speciic — never abuse generalities. It should （）exactly what you’re going to do, when, where, and how you’ll do it.

Possible — never be impossible. A good （）details things that you’re capable of doing （） .

Written — not dependent on memory or willpower. That’s because you’re more likely to do something that you’ve put down （） .

A: It is very kind of you to （）! Thank you very much!

B: It’s my pleasure.

Other useful words for reference: simple, easy to follow, practical, complicated, speciic, hard, negative, positive, possible, exact time, capable, dependent, likely, invest, inevitably

Answer: 1. amazing 2. exhausted 3. study and all kinds of activities 4. both work and play well 5.challenge 6.what I could do to adapt myself to the new situation 7.more organized and disciplined 8.wise 9.have a study plan 10.a good idea 11.make a study plan 12.5 steps to make a good study plan 13.you need to make this plan a permanent part of your life, so buy a good quality notebook to hold it in 14.start with your broad education goals 15.get into passing each individual course 16.includes all of your courses 17.keep a daily “to do”list in your notebook.Most successful people consider it a necessary step for making the best use of their time 18.evaluate. At the end of each day, before you retire for the night, you should go through your study plan and see whether you have completed it 19.good study 20.examples 21.state 22.study plan 23.requently 24.on paper 25.offer me such helpful advice

Unit 2>PassageA

3 We all have dreams. Our dream, or aspiration, or vision, is the song of our soul. It is our dream that 1) （）our life with meaning and purpose. Many a successful person 2) （）a dream to the flame of hope toward victory. We all have 3) （）in realizing our dreams. But once we believe we can do it, we will find solutions to the problems we 4) （）. If you believe in your dream, the next step is to make a 5) （）. With your commitment, great power will be 6) （）and seemingly insurmountable hurdles will be 7) （）to insignificant obstacles. Our dreams don’t have to be grand to be great. We all have the power to follow a dream that will make a 8) （）to us and those we meet. As we dream, 9)（）shall we become. Our vision is the 10) （）of what we shall be in the future.

Answer: 1.fills, https://www.sodocs.net/doc/03365788.html,pared, 3.problems, 4.stumble on, 5.register,

6.released,

7.reduced,

8.difference,

9.so, 10.promise

4 1.The best way to （）what’s on the list is to give each task a specific time slot.

2. （）is the desire for personal achievement. It provides the motivation and determination necessary to achieve a particular end or condition.

3. Women today have the chance to pursue their own careers, but still have to overcome many （）to gain real equality.

4. That school （）in baseball. This has been the third time they have won the National Youth Championship in the 21st century.

5. There is （）nothing we can do to stop the plans from going ahead. But we can at least prevent the situation from getting worse.

6. （）is the desire for personal achievement. It provides the motivation and determination necessary to achieve a particular end or condition.

7. Women today have the chance to pursue their own careers, but still have to overcome many （）to gain real equality.

8. That school （）in baseball. This has been the third time they have won the National Youth Championship in the 21st century.

9. There is （）nothing we can do to stop the plans from going ahead. But we can at least prevent the situation from getting worse.

10. There is （）nothing we can do to stop the plans from going ahead. But we can at least prevent the situation from getting worse.

Answer: 1. accomplish 2. Ambition 3. obstacles 4. dominates 5. seemingly

6. vision

7. solutions

8. releasing

9. individuals10. ideal

5 1. Researchers have （）a drug that may help patients with Parkinson’s disease. This may be one of the great discoveries of the century in medicine.

2. There are so many applicants. How can we （）a really good person for the job?

3. Does everyone know what to do if a fire （）? This question should be asked often.

4. It was my daughter’s birthday and she invited several of her good friends to the party. The

air was （）the sound of children’s laughter.

5. The festivities （）a huge fireworks display. Following that, there would usually be dance parties or other activities. Answer: 1.stumbled on 2. seek out 3.breaks out 4.filled with 5.started with

7 1. 我们急匆匆地赶到火车站，结果发现火车刚刚开走。(only to)

Answer:We hurried to the railway station, only to find the train had just left.

2. 你和你哥哥都不是细心的人，你们两个都不能做这件需要细心和技巧的工作。(no more than)

Answer:You are no more careful than your brother. You two can’t do the work that needs care and skill.

3. 多一个人参会对会议安排不会有什么影响。(make a difference)

Answer:One more person wouldn’t make any difference to the meeting arrangements.

4. 他一直工作到昨天深夜，或者更确切地说，是到今天凌晨。(rather)

Answer:He worked till late last night, or rather, early in the morning.

5. “还有其他一两本书也值得一提，”教授给我们列了一个长长的参考书目后补充说。(worthy of)

Answer:“A couple of other books are also worthy of mention,”added the professor after giving us a long list of reference books.

Unit .3

3 As a freshman, there’s really something you might be eager to find on campus, i.e. the chance to throw yourself into the world of University Societies, and discover the huge range of activities at Oxford.

Your first move should be to check out the large array of clubs at the OUSU 1) （）, from which you will get a brand-new edition of the comprehensive 2) （）to all things at Oxford. If you miss the fair, you can still see what societies are offered in The Oxford Directory, a 3) （）issued to you in Freshers’ Week.

The degree to which people get involved in societies 4) （）. Some totally 5) （）themselves in a club, rising to become a leader of the organization; others take a more 6) （）approach, being members of several societies and taking part in whichever interesting; while many people, perhaps foolishly, completely ignore university societies and just 7) （）with mates in college.

Societies offer a great chance to 8) （）people from outside college. If you have ambitions to 9) （）a new society, you can register it, with start-up 10) （）and loans, among other benefits.

Answer: 1.Freshers’ Fair, 2.guide, 3.handbook, 4.varies, 5.immerse,

6.eclectic,

7.hang out,

8.meet,

9.open up, 10.grants

4 1. The sort of music he listens to varies, but it to be popular music. （）

2. Language is the medium of , and when we learn a foreign language, we are exposed to a culture quite different from ours. （）

3. Scientific discoveries are often to industrial processes.（）

4. I hope you are not getting listening to me.（）

5. Can you me two good seats for the concert?（）

6. This is a amusing film. You'll regret if you miss it.（）

7. He gave a answer to my request. I felt quite confused and disappointed. （）

8. She was annoyed by the young man's impolite .（）

9. Ever since that unhappy incident, I have tried to any further conflict with him. （）

10. The driver the traffic light, and as a result, he ran into another car.（）Answer: 1.tends, 2.culture, 3.applied, 4.bored, 5.secure,

6.highly,

7.negative,

8.behavior,

9.avoid, 10.ignored

5 1. They normally （）in the pub to kill time.

2.I’ve been trying to （）the restaurants in my new neighborhood to find the best one.

3. Bob took a part-time job （）handbills (传单) for a cosmetic (化妆品) company.

4. Back from the holiday, she eagerly （）the production of a new film.

5. I （）work so as to stop thinking about her.

Answer: 1.hang out, 2. check out, 3. giving out, 4. threw herself into, 5. immersed myself in

6 1. The American space agency has drawn up a shortlist of ten research projects that will form the basis of an （）program to explore the planet Mars next year. (ambition)

2. As the saying goes, “（）we stand, divided we fall.” (union)

3. Eugene O'Neill wrote more than 35 plays and was the first American （）awarded

a Nobel Prize for Literature. (drama)

4. I am retired and now working as a （）in an organization helping orphans. (voluntary)

5. Compared to some other developing countries, the cell phone market in China is （） . (flourish)

Answer: 1.ambitious 2. United 3. dramatist 4. volunteer 5. flourishing

7 1. 这钢琴有些不对劲，但是我无法说清楚。(put one's finger on)

Answer:Something is wrong with the piano, but I can't put my finger on what it is.

2.这条裤子不但太大，而且也与我的夹克不相配。(apart from)

Answer:Apart from being too large, the trousers don't match my jacket, either.

3. 不论理由是什么，反正我喜欢流行音乐。(whatever)

Answer:I love pop music, for whatever reasons.

4. 他对外国文化怀有浓厚的兴趣，经常博览群书以寻找有用的信息。(browse through)

Answer:He has great interest in foreign cultures, often browsing through piles of books to look for any useful information.

5. 在是否要创办一个新社团的问题上，我们意见很不一致。(vary)

Answer:Opinions on whether we should open up a new society vary a great deal.

Unit 3 PA B

10 What does the author mainly tell us in the passage?（您未选择此题答案）

A) A well-balanced life is not easy to have in today's world.

B) She has experienced great stress in her study and work.

C) Satisfying work is crucial to having a well-balanced life.

D) Leisure time plays a vital role in maintaining a well-balanced life.

What does the author mean by saying "Finally I found a way out in my leisure time"?（您未选择此题答案）

A) She found leisure time could help relieve her stress and maintain a well-balanced life.

B) She found a way to enjoy herself in her leisure time.

C) She got to know how to spend her leisure time.

D) She came to understand what "a well-balanced life" means.

When does the author listen to slow music?（您未选择此题答案）

A) When she is happy.

B) When she is lonely.

C) When she is sad.

D) When she is trying to work.

How important are good friends to the author? （您未选择此题答案）

A) They usually help her lift the physical burden with their strong backbone.

B) They support her in everything she does and help her in every situation she is in.

C) They often pull her aside and invite her to go for a walk.

D) They will do everything that she wants them to do.

What main suggestion does the author give us in the passage on how to relieve stress?

A) T alking to friends.

B) Listening to music.

C) Reading poetry.

D) Pursuing some leisure activities.

Answer: 1.D, 2.A, 3.C, 4.B, 5.D

13 1. She is very busy; she doesn’t have much time.

2. He is under a lot of ,because his wife is very ill.

3. He himself very quickly to changes in culture when he came to of the country.

4. What about going to the concert with me? The music will help you .

5. Your support is to the success of my plan.

6. The hought of having to take the examination again me.

7. A little drinking does no harm; but don’t drink too much.

8. The drug my toothache. It was really effective.

9. It was a difficult situation but he it very well.

10. To a happy mood is very important in one’s study and work.

Answer: 1.leisure, 2.stress, 3.has adjust, 4.relax, 5.vital,

6.depressed,

7.social,

8.relieved,

9.handled, 10.maintain

14 1. The country too many wars, causing great suffering and poverty.

2. I lost my job, and the rise in power costs our difficulties.

3. The scandal the resignation (辞职) of the President.

4. I can not on such a small salary.

5. I can not why she said she no longer loved me.

Answer: 1.went through, 2. added to, 3. led to, 4. get by, 5. figure out

16

passageA：

Many activities help you 1)（）the time on campus. But only when you 2)（）yourself into the world of University Societies, can you 3)（）out what goes on in the university. At Oxford, your first move should be to check out the bewilderingly large array of 4)（）at the Freshers’ Fair. The degree to which people get involved in 5)（）varies. Some students totally 6)（）themselves in a club, others prefer to take a more eclectic approach, while many completely 7)（）University Societies and just 8)（）out with mates in college. Societies offer a great chance to 9)（）people from outside college. With over 300 registered societies at Oxford, there really is something for everyone. You won’t get 10)（）.

passageB：

A 1)（）life is necessary to live in today’s world. I’ve experienced great 2)（）in my study and work. And I finally find a way out in my 3)（）time. I spend most of my 4)（）time reading, listening to music, talking to my real life friends, or talking on the Internet with people I meet. Stress can be a very 5)（）and 6)（）experience. But when it 7)（）, you can do something other than wait, like talking to your friends or listening to music. Then you may not think you would have been so

stressed and 8)（）. A well-balanced life is important to 9) （）. And leisure time plays a 10) （）role.

Answer:

Passage A: 1.pass , 2.throw , 3.find , 4.clubs , 5.societies, 6.immerse , 7.ignore , 8.hang , 9.meet , 10.bored

Passage B: 1.well-balanced , 2.stress , 3.leisure , 4.extra, 5.dangerous, 6.tiresome, 7.happens, 8.depressed, 9.maintain, 10.vital

Unit 4> Passage A

3 The author decided early in her college years that she wanted to experience （）before entering （） .

Answer:living abroad;the "real world"

When she was in her senior year, the author was investigating how she could （）in a different country, while most of her friends were （）"real world" jobs.

Answer:go and work; interviewing for

Her desire （）was so strong that she （）anywhere.

Answer:to live abroad;was willing to do anything

BUNAC is （）that seems to be designed precisely for students （）of working in a different country.

Answer:a program; with the interest

The author chose England because of the （）and the （）for

employment.

Answer:language;opportunities

Two months after she （）, she crossed the Atlantic, （）Europe for six months before arriving in London.

Answer:graduated from college; traveled throughout

After she arrived in England, she was scared about （）since her （）were running low and she needed to get a （）soon.

Answer:finding a job; financial resources ; paycheck

The author easily （）since the BUNAC program was （）there and many （）participated in the program.

Answer:found a job in London; very well-known;employers

The author （）her first job offer working for an （） . Her office was in a beautiful, old building （）two blocks from Buckingham Palace.

Answer:accepted; international bank; located

The author thought working in London had been （）she had made. She would not （）to recommend it to anyone.

Answer:the best decision;hesitate for a second

4 The channel tunnel (英吉利海峡隧道) is one of the biggest engineering projects ever .

He took it as an insult (侮辱) which wasn't at all what I .

As a freshman, you should get to know campus as soon as possible and make good use of them.

He had made many into the quality of the computer before buying one.

The police many cases by following the footprints (脚印) left at the scene of the crime.

I'm thinking of buying a car. Can you a good make (牌子) to me?

Not only does Mary attend class regularly, but she also in extracurricular activities frequently.

With the rapid development of the economy, all of our life have changed a great deal.

Tom is such a nice guy. He will not a moment to offer help when you are in trouble.

This system is extremely (非常地) because it runs on half-price electricity.

Answer: 1.undertaken, 2.had intended, 3.resources, 4.inquiries, 5.investigated,

6.recommend,

7.participates,

8.aspects,

9.hesitate, 10.economical

5 My CD player is beeping, for the battery is .

It that the kids had spent the whole day playing video games. .

She was the only woman to the experiment and was among the few volunteers (志愿者) who died from it.

People teach the computer to think and , develop and sharpen their own reasoning abilities.

This kind of digital TV is considered the best that has been made in our country.

Answer: 1. running low 2. turned out 3. participate in 4. as a result

5. so far

Passage B

11

According to the passage, the author decided to leave home because __________. （您未选择此题答案）

A) he liked to live on campus

B) he had trouble getting along with his parents

C) he had to study in another city

D) he felt he was old enough to leave home

According to the passage, the author became __________ after he lived on his own. （您未选择此题答案）

A) more responsible

B) more experienced

C) more industrious

D) more dependent

From the passage, we can see that the author __________. （您未选择此题答案）

A) always decided on things by himself

B) often made decisions when he was studying in middle school

C) seldom made decisions by himself when he was in middle school

D) never decided on anything by himself

What did the author think was the nicest thing in the world ? （您未选择此题答案）

A) Being independent.

B) Being responsible.

C) Being creative.

D) Being more decisive.

The passage mainly tells us that __________. （您未选择此题答案）

A) one can be more carefree by living on one's own.

B) one can enjoy more freedom by living on one's own.

C) one can get along better with one's parents by living on one's own.

D) one can become more responsible, decisive and creative while living on one's own.

Answer: 1.B, 2.A, 3.C, 4.C, 5.D

12 1 .The first time the author （）home was when he was a （）in high school.

2 .First of all, he learned that （）required that he became （）.

3 .Another （）while living on his own was that he become （）.

4. He could also become （）by living on his own as he had to make （）.

5 .The author holds that it was （）for everyone in this world （）and themselves before they love anyone else.

Answer: 1. decided to leave; sophomore 2. living on his own; more responsible 3. different experience; more decisive 4. more creative ; his own future plan 5. appropriate; to love their

parents

13 After they had arrived at the campus, a girl was to guide them on a tour of the halls.

In ,we all hoped that more activities like this could be organized.

He was a well-known author who had many unforgettable characters in his novels.

The injury of their key player could be a(n) factor in the game.

Don's you think that the Oxford English Dictionary is an on English words?

To be a top student, you need diligence and persistence in to intelligence.

As he has been in America for 3 years now, he is for China.

Don's be too dressy. Plain, simple clothes are for school wear.

There were not many people who dared predict the the next World Cup.

You are not supposed to your name on the tree in the park.

Answer: 1.assigned, 2.conclusion, 3.created, 4.decisive, 5.authority,

6.addition,

7.homesick,

8.appropriate,

9.outcome, 10.carve

Unit 5> Passage A

3 The author tells us his 1) （）experience with a telephone 2) （）to show us that you can never 3) （）the impressions you may make on others. When he was young, he 4) （）his finger with a 5) （）while staying alone at home. It was at this time he received some good advice on the phone from the “Information, please”operator. When his pet bird died, the operator 6) （）him. For this act of kindness the boy 7) （）her （）being so patient, understanding, and kind but also for spending so much of her time on him. Over the years he called her many more times and developed a friendship with her. He later moved away from his hometown but 8) （）her whenever he returned to visit. Eventually she died, but before dying she left a 9)

（）or him with the new “Information, Please” operator so that he would not be so sad and able to remember her with 10) （）of how she had influenced his life. Like the bird, she said she’d too have “other worlds to sing in”.

Answer: 1.personal, 2.operator, 3.underestimate, 4.hurt, 5.hammer,

6.soothed or comforted,

7.appreciated …for,

8.dialed,

9.message, 10.fond memories

4 When they arrived there, he lay on the floor, his nose .

I think she’s right but I’m not completely sure.

I’d it if you would turn the radio down.

We were greatly to hear about his sitting on the wet paint.

Greece’s poor economic performance was a cause for the growing public .

It us to hear that you were leaving. Why not tell us a bit earlier?

You needn’t worry about him. This kind of medicine will help to his wound soon.

I’m afraid I’ve a piece out of this saucer.

She has got used to milk through a straw though she is only two months old.

The old woman had to support her family by washing a of dirty clothes every day though she had suffered a deadly disease.

Answer: 1.bleeding, 2.somehow, 3.appreciate, 4.amused, 5.concern,

6.amazed,

7.heal,

8.chipped,

9.sucking, 10.heap

5 1 The engine failed and the pilot had to （）the plane （）in the sea.

2. Carol’s mother told her she had talked long enough on the phone and made her （）.

3. People who work too much and earn more money may less happier than those who earn less money but enjoy life.

4. nobody is against it, we will adopt (采用) the proposal.

5. This balloon remained in flight for 50 minutes .

Answer: 1.put ... down 2.hung up 3.end up 4.Now that 5.or so

6 I was very __________ to the librarian for helping me find the book I urgently needed.

A) grateful

B) helpful

C) skillful

D) hopeful

1This kind of cell phone is __________ available in any telecommunications shop.

A) costly

B) likely

C) readily

D) effectively

2This documentary aroused public __________ for the victims of the Terrorist Attack. 3A) symbol

B) sympathy

C) suspect

D) symphony

4When she heard of her grandfather’s death, she couldn’t help __________. （您未选择此题答案）

A) to weep

B) weep

C) weeping

D) wept

大学体验英语综合教程2课后答案第三版

大学体验英语综合教程2课后翻译 UNIT1 1A P15 4. 1.elected, 2.minimum, 3.distinct, 4.responsibility, 5.pursue, 6.exploit, 7.restrict, 8.equip, 9.granted, 10.awarded 5. 1.at large, 2.on the basis of, 3.in support of, 4.apply for, 5.is aiming at 1任何年满18岁的人都有资格投票(vote)。(be eligible to) Anyone over the age of 18 is eligible to vote. 2.每学期开学前，这些奖学金的申请表格就会由学校发给每一个学生。(apply for, scholarship) A form to apply for these scholarships is sent by the university to each student before the start of each semester. 3. 遵照医生的建议，我决定戒烟。(on the advice of) On the advice of my doctor, I decided to give up smoking. 4.公园位于县城的正中央。(be located in) The park is located right in the center of town. 5.这所大学提供了我们所需的所有材料和设备。(facilities) The university provides all the materials and facilities we desire. 1B p21 13. 1.challenge, 2.had transformed, 3.engage, 4.occurred, 5.urged, 6.cancel, 7.prejudice, 8.foundation, 9.beliefs, 10.constructive 14. 1.rests with, 2.in recognition of, 3.in fact, 4.provides for, 5.keep...up 1. 他内心深处知道，他们永远也不会再见了。(in one’s heart) He knew in his heart that they would never meet again. 2.他们同意出版他的第一本书后，他终于感到自己快要成功了。(on the road to) He finally felt that he was on the road to success after they agreed to publish his first book. 3.他停下来喝了一口(a sip of)水，然后继续讲话。(resume) He stopped to take a sip of water and then resumed speaking. 4.这个大项目使我们忙得今年都无法安排一次度假了。(engage; so much that) The big project engages us so much that we can’t manage to take a holiday this year. 5.氧气(oxygen)是气体中最重要的一种，正如水是液体中最重要的一种一样。(just as) Just as water is the most important of liquids, oxygen is the most important of gases. UNIT2 2A p37 4. 1.version, 2.publications, 3.click, 4.spotted, 5.refugees, 6.entries, 7.financial, 8.full-time, 9.detailed, 10.annual 5. 1.set up, 2.came across, 3.referred...to , 4.check out, 5.learnt of / learned of 1. 警察们正忙着填写关于这场事故的各种表格。(fill out) The policemen are busy filling out forms about the accident.

最新第1章 随机过程的基本概念习题答案

第一章 随机过程的基本概念 1．设随机过程 +∞<<-∞=t t X t X ,cos )(0ω，其中0ω是正常数，而X 是标准正态变量。试求X （t ）的一维概率分布 解：∵ 当0cos 0=t ω 即 πω)2 1 (0+ =k t 即 πω)21(10+=k t 时 {}10)(==t x p 若 0cos 0≠t ω 即 πω)2 1 (1 0+≠ k t 时 {}{}x t X P x x X P t x F ≤=≤=0cos )(),(ω 当 0cos 0>t ω时 ξπ ωωξd e t x X P t x F t x ? - = ??? ? ??≤=02 cos 0 2 021cos ),( 此时 ()t e x t x F t x f t x 0cos 2cos 1 21,),(022ωπ ω? =??=- 若 0cos 0

?? ?= ,2 ,cos )(出现反面出现正面t t t X π 假定“出现正面”和“出现反面”的概率各为21。试确定)(t X 的一维分布函数)2 1 ,(x F 和)1,(x F ，以及二维分布函数)1,2 1;,(21x x F 解：（1）先求)21,(x F 显然???=?? ???-=??? ??出现反面出现正面 出现反面出现正面10,212,2cos 21π X 随机变量?? ? ??21X 的可能取值只有0，1两种可能，于是 21 021= ??????=?? ? ??X P 2 1121=??????=??? ??X P 所以 ?????≥<≤<=??? ?? 11102 1 0021,x x x x F 再求F （x ,1） 显然? ??-=???=出现反面出现正面出现反面出现正面 2 1 2 cos (1)πX {}{}2 1 2)1(-1 (1)====X p X p 所以 ???? ???≥<≤<=2 121- 2 1-1 0,1)(x x x x F (2) 计算)1,2 1 ;,(21x x F ???-=???=出现反面出现正面出现反面出现正面 2 1)1(, 1 0)2 1 ( X X 于是

大学体验英语3 答案(第三版)

1 Lead-in1. human beings 2. powered 3. greenhouse 4. far away 5. make a difference 6. breathe in 7. decreasing performance 8. four inches high 9. campaign 10. Encourage 4greenhouse residence communicate wired humming message sensitivity indicator 5、1. d 2. a 3. b 4. e 5. c 1. tone threatening 2. sensitivity smell 3. affected climate 4. tap resources 5. concerns environment 6、1. subtle 2. were overtaken 3. species 4. decades 5. boundaries 6. audio 7. directly 8. focus 9. tone 10. Cupped 7、1. at that rate 2. For the sake of 3. come to 4. by hand 5. vice versa 8、1. 年轻人有时会抱怨无法和父母沟通。(communicate with) Answer: Young people sometimes complain of being unable to communicate with their parents. 2. 能在中国云南的一个苗家村落住下来一直是玛丽长久以来的梦想，现在她终于梦想成真了。(to take up residence) Answer: It has been Mary’s long cherished dream to take up residence in a Miao village in Yunnan, China. Now her dream has finally come true. 3. 家养的动物习惯于依赖人，因此很难能在野外活下来。(survive) Answer: Domestic animals are used to depending on humans, so it is difficult for them to survive in the wild. 4. 他突然有种恐惧感，觉得自己会因为经济不景气而被公司裁员。(overtake) Answer: He was suddenly overtaken by a fear that he would be laid off by the company because of depression. 5. 我估计公交路线上堵车了，因为我都等了30分钟也没见一辆车开过去。(figure) Answer: I figure that there is a traffic jam on the route of the bus, for I’ve waited for 30 minutes without seeing one passing by. 15、Read and translate 4. Translate the following sentences into English. 1. 十年前，当公司还处在生产的鼎盛时期时，我们就决定投资新技术，将公司转型为技术密集型企业。由于拥有先进技术，我们在激烈动荡的市场竞争中脱颖而出。现在我们的成本下降了百分之三十，销售业绩却上涨了三分之二，利润翻了一番。Answer: Ten years ago, when our company was at the height of its production, we decided to invest in new technologies, so as to turn our company into a technology-intensive one. With our advanced technologies, we out-competed all our competitors in the rough and tumble of the marketplace. Now we have reduced the cost by 30 percent, even as / while our sales have grown by two-thirds and the earnings have doubled. 2. 我们将可持续性定义为保持企业盈利，但不以环境为代价。从商业的角度看，这合理吗？事实上，在追求可持续发展目标的过程中，我们的收益已经超过了所有的投资和开支。可持续发展的推进起到了如此重要的作用，帮助我们撑过了史上最深重的经济衰退。Answer: We define sustainability as keeping a business profitable, but not at the expense of the environment. Does this make good business sense? Actually, what we get has more than offset all the investments and expenses incurred in pursuit of the goal of sustainable development. The boost of sustainability made such a difference that it helped us survive the deepest recession in the history.

操作系统课后习题答案

第一章 1．设计现代OS的主要目标是什么？ 答：（1）有效性（2）方便性（3）可扩充性（4）开放性 4．试说明推劢多道批处理系统形成和収展的主要劢力是什么？ 答：主要动力来源于四个方面的社会需求与技术发展： （1）不断提高计算机资源的利用率； （2）方便用户； （3）器件的不断更新换代； （4）计算机体系结构的不断发展。 12．试从交互性、及时性以及可靠性方面，将分时系统不实时系统迚行比较。答：（1）及时性：实时信息处理系统对实时性的要求与分时系统类似，都是以人所能接受的等待时间来确定；而实时控制系统的及时性，是以控制对象所要求的开始截止时间或完成截止时间来确定的，一般为秒级到毫秒级，甚至有的要低于100微妙。 （2）交互性：实时信息处理系统具有交互性，但人与系统的交互仅限于访问系统中某些特定的专用服务程序。不像分时系统那样能向终端用户提供数据和资源共享等服务。 （3）可靠性：分时系统也要求系统可靠，但相比之下，实时系统则要求系统具有高度的可靠性。因为任何差错都可能带来巨大的经济损失，甚至是灾难性后果，所以在实时系统中，往往都采取了多级容错措施保障系统的安全性及数据的安全性。 13．OS有哪几大特征？其最基本的特征是什么？ 答：并发性、共享性、虚拟性和异步性四个基本特征；最基本的特征是并发性。 第二章 2. 画出下面四条诧句的前趋图: S1=a：=x+y; S2=b：=z+1; S3=c：=a –b；S4=w：=c+1; 8．试说明迚程在三个基本状态之间转换的典型原因。 答：（1）就绪状态→执行状态：进程分配到CPU资源 （2）执行状态→就绪状态：时间片用完 （3）执行状态→阻塞状态：I/O请求 （4）阻塞状态→就绪状态：I/O完成

大学体验英语综合教程2 第三版 U5 Passage A 课后答案及课文翻译

Unit 5

Reference Translation Unit 5 PA 奉告学子：教育是关键 比尔·盖茨 每年都有数以百计的学生给我发电子邮件，要我就接受教育给他们提建议。他们想知道该学些什么，或者可不可以从大学辍学，因为我就没有读完大学。 也有不少家长给我写信，为子女寻求指导。他们问：“我们怎样才能把孩子引向成功之路？” 我的基本忠告很简单，而且是发自内心的：全力获得最佳教育，充分利用高中和大学，学会如何学习。 不错，为创建微软，我未完成大学学业，不过辍学之前我已经在哈佛呆了三年，而且我

真心希望有一天能重返校园。以前我也说过，谁也不应该辍学，除非他坚信自己正面临着一个一生仅有一次的机会，但就算在那个时候也还是应该深思熟虑。 在俄亥俄州教六年级的老师凯西·克里德兰写道，“我的好几个学生声称你根本没有读完高中。因为你成功了，我的学生就觉得他们也可以不必要接受良好的教育。” 我高中毕业了的! 计算机行业中确实有很多人没有读完大学，但是我从来没有见过有谁高中没读完就成功创业的。确切地说，我认识的人当中根本没有高中辍学的，更没有高中辍学后事业成功的。 我的公司创立早期，有一个相当出色的兼职程序员，声称要从高中辍学来做全职。我们叫他不要这么做。 我们公司里确实有好些人没有读完大学，但我们不希望人们辍学。谁要想在我们公司谋职，有毕业证书肯定会优先考虑。 不一定只有在大学才能获取信息，在图书馆也可以学习。但人家递给你一本书并不能自动地让你学到东西。你需要向别人学习，提问题，将设想付诸实施，设法验证自己的能力。这一切，往往不是读一两本书就可以做得到的。 接受的教育应该是广泛的，虽然对某些领域情有独钟也不失为一件好事。 读高中时，我有一段时间醉心于软件编写，但大部分时间里，我的学习兴趣相当广泛。我父母鼓励我这么做，对此我感激不尽。 大学期间，我修了很多不同的课程，但我从头至尾只选修了一门计算机课。我读书涉猎很广。 有位家长写信说，她15岁的儿子“钻进计算机无底洞里了”。他的网站设计课得了“A”，但别的科目分数都在下降，她写道。 这个孩子犯了一个错误。高中和大学给你提供了最佳机会，你可以广泛学习——数学，历史，各种学科——有机会跟着别的孩子一起做项目，亲身感受到群体的动力。你对计算机、舞蹈、语言或其他任何的科目有深入的兴趣也无可厚非，但太偏执而舍弃学习广度就不是一件好事了。 如果高中阶段兴趣过于集中，你会面临两个问题。第一个就是进了大学以后你很可能没法改变。另一个问题就是如果分数不够高，你就很难考入大学，而无法向那些积极性很高，很有才能的学生一起学习，他们可以真正帮助你了解这个世界。 大学期间可以适当考虑专业的问题。深入掌握自己感兴趣的领域的专业知识，能够引导你走向成功，除非这个专业没有发展前途，或者你并不很擅长这个方面。读研究生是获取专业知识的一个途径，虽然从纯经济角度来看，大学毕业后再接受教育不一定算是明智的投资。 4. 1. was sinking 2. specialty 3. purely 4. discourage 5. unlikely 6. dynamics 7. actually 8. reasonably 9. have perceived 10. extended 5. 1.took a deep interest in 2. fell into 3. sign up

大学体验英语3综合教程课文翻译

Unit 1> Caring for Our Earth Passage A Frog Story 蛙的故事 A couple of odd things have happened lately. 最近发生了几桩怪事儿。 I have a log cabin in those woods of Northern Wisconsin. I built it by hand and also added a greenhouse to the front of it. It is a joy to live in. In fact, I work out of my home doing audio production and environmental work. As a tool of that trade I have a computer and a studio. 我在北威斯康星州的树林中有一座小木屋。是我亲手搭建的，前面还有一间花房。住在里面相当惬意。实际上我是在户外做音频制作和环境方面的工作——作为干这一行的工具，我还装备了一间带电脑的工作室。 I also have a tree frog that has taken up residence in my studio. 还有一只树蛙也在我的工作室中住了下来。 How odd, I thought, last November when I first noticed him sitting atop my sound-board over my figured that he(and I say he,though I really don’t have a clue if she is a he or vice versa) would be more comfortable in the greenhouse. So I put him in the greenhouse. Back he came. And stayed. After a while I got quite used to the fact that as I would check my morning email and online news, he would be there with me surveying the world. 去年十一月，我第一次惊讶地发现他（只是这样称呼罢了，事实上我并不知道该称“他”还是“她”）坐在电脑的音箱上。我把他放到花房里去，认为他待在那儿会更舒服一些。可他又跑回来待在原地。很快我就习惯了有他做伴，清晨我上网查收邮件和阅读新闻的时候，他也在一旁关注这个世界。 Then, last week, as he was climbing around looking like a small gray / green human, I started to wonder about him. 可上周，我突然对这个爬上爬下的“小绿人或小灰人”产生了好奇心。 So, there I was, working in my studio and my computer was humming had to stop when Tree Frog went across my stopped and turned around and just sat there looking at ,I sat back and looked at him. For five months now he had been riding there with me and I was suddenly overtaken by an urge to know why he was there and not in the greenhouse,where I figured he’d live a happier frog life. 于是有一天，我正在工作室里干活，电脑嗡嗡作响。当树蛙从我面前爬过时，我不得不停止工作。他停下了并转过身来，坐在那儿看着我。好吧，我也干脆停下来望着他。五个月了，他一直这样陪着我。我突然有一股强烈的欲望想了解他：为什么他要待在这儿而不乐意待在花房里？我认为对树蛙来说，花房显然要舒适得多。 “Why are you here,” I found myself asking him. “你为什么待在这儿？”我情不自禁地问他。 As I looked at him, dead on, his eyes looked directly at me and I heard a tone. The tone seemed to hit me right in the center of my mind. It sounded very nearly like the same one as my computer. In that tone I could hear him “say” to me, “Because I want you to understand.” Yo. That was weird. “Understand what?” my mind jumped in. Then, after a moment of feeling this communication, I felt I understood why he was there. I came to understand that frogs simply want to hear other frogs and to

随机过程习题答案A

随机过程习题解答（一） 第一讲作业： 1、设随机向量的两个分量相互独立，且均服从标准正态分布。 （a）分别写出随机变量和的分布密度 （b）试问：与是否独立？说明理由。 解：（a） （b）由于： 因此是服从正态分布的二维随机向量，其协方差矩阵为： 因此与独立。 2、设和为独立的随机变量，期望和方差分别为和。 （a）试求和的相关系数； （b）与能否不相关？能否有严格线性函数关系？若能，试分别写出条件。 解：（a）利用的独立性，由计算有： （b）当的时候，和线性相关，即 3、设是一个实的均值为零，二阶矩存在的随机过程，其相关函数为 ，且是一个周期为T的函数，即，试求方差 函数。 解：由定义，有： 4、考察两个谐波随机信号和，其中：

式中和为正的常数；是内均匀分布的随机变量，是标准正态分布的随机变量。 （a）求的均值、方差和相关函数； （b）若与独立，求与Y的互相关函数。 解：（a） （b） 第二讲作业： P33/2．解： 其中为整数，为脉宽 从而有一维分布密度： P33/3．解：由周期性及三角关系，有： 反函数，因此有一维分布： P35/4. 解：(1) 其中 由题意可知，的联合概率密度为：

利用变换：，及雅克比行列式： 我们有的联合分布密度为： 因此有： 且V和相互独立独立。 （2）典型样本函数是一条正弦曲线。 （3）给定一时刻，由于独立、服从正态分布，因此也服从正态分布，且 所以。 （4）由于： 所以因此 当时， 当时， 由（1）中的结论，有： P36/7．证明： (1) (2) 由协方差函数的定义，有：

P37/10. 解：（1） 当i =j 时；否则 令 ，则有 第三讲作业： P111/7．解： （1）是齐次马氏链。经过次交换后，甲袋中白球数仅仅与次交换后的状态有关，和之前的状态和交换次数无关。 （2）由题意，我们有一步转移矩阵： P111/8．解：（1）由马氏链的马氏性，我们有： （2）由齐次马氏链的性质，有： （2）

大学体验英语综合3课后答案

大学体验英语综合3课后答案

大学体验英语-综合教程3 Unit1 Passage A Care for Our Mother Earth Read and think 3 1~5 BBCAD Read and complete 6 1.strategies 2.specific 3.consumers 4.released 5.trapped 6.consequence 7.was isolated 8.priority 9.convenience 10.elements Read and complete 7 1.transform 2.all the way 3.sit back 4.resulting from 5.share…with Read and translate 8

1.How did the war, which brought terrible disasters to mankind, impact on such a poet? 2.Mothers are sometimes blind to the faults of their beloved children, which will cause the children to make the same mistakes again. 3.As a new immigrant in this completely strange country, she always felt isolated. 4.Acting before thinking often results in failure, so we should think before we leap. 5.The time for talking has passed, we must take a positive action to protect our environment. Passage B Frog Story Read and think 12 1~5 DACAB Read and complete 13 1.subtle 2.were overtaken 3.species 4.decades 5.boundaries 6.audio

操作系统课后题及答案

第一章 1 ．设计现代OS 的主要目标是什么？ 答：（1）有效性（2）方便性（3）可扩充性（4）开放性 2 ．OS 的作用可表现在哪几个方面？ 答：（1）OS作为用户与计算机硬件系统之间的接口 （2）OS 作为计算机系统资源的管理者 （3）OS 实现了对计算机资源的抽象 4 ．试说明推动多道批处理系统形成和发展的主要动力是什么？答：主要动力来源于四个方面的社会需求与技术发展： （1）不断提高计算机资源的利用率； （2）方便用户； （3）器件的不断更新换代； （4）计算机体系结构的不断发展。 7 ．实现分时系统的关键问题是什么？应如何解决？答：关键问题是当用户在自己的终端上键入命令时，系统应能及时接收并及时处理该命令，在用户能接受的时延内将结果返回给用户。 解决方法：针对及时接收问题，可以在系统中设置多路卡，使主机能同时接收用户从各个终端上输入的数据；为每个终端配置缓冲区，暂存用户键入的命令或数据。针对及时处理问题，应使所有的用户作业都直接进入内存，并且为每个作业分配一个时间片，允许作业只在自己的时间片内运行，这样在不长的时间内，能使每个作业都运行一次。 12 ．试从交互性、及时性以及可靠性方面，将分时系统与实时系统进行比较。 答：（ 1 ）及时性：实时信息处理系统对实时性的要求与分时系统类似，都是以人所能接受的等待时间来确定；而实时控制系统的及时性，是以控制对象所要求的开始截止时间或完成截止时间来确定的，一般为秒级到毫秒级，甚至有的要低于100 微妙。 （2）交互性：实时信息处理系统具有交互性，但人与系统的交互仅限于访问系统中某些特定的专用服务程序。不像分时系统那样能向终端用户提供数据和资源共享等服务。 （3）可靠性：分时系统也要求系统可靠，但相比之下，实时系统则要求系统具有高度 的可靠性。因为任何差错都可能带来巨大的经济损失，甚至是灾难性后果，所以在实时系统中，往往都采取了多级容错措施保障系统的安全性及数据的安全性。 13 ．OS 有哪几大特征？其最基本的特征是什么？答：并发性、共享性、虚拟性和异步性四个基本特征；最基本的特征是并发性。

大学体验英语2第三版课文翻译PASSAGEA课后翻译

大学体验英语2第三版课文翻译PASSAGEA课后翻译Unit1 1.任何年满18岁的人都有资格投票。 Anyone over the age of 18 is eligible to vote. 2.每学期开学前，这些奖学金的申请表格就会由学校发给每一个学生。 A form to apply for these scholarships is sent by the university to every student before the start of every semester. 3.遵照医生的建议，我决定戒烟。 On the advice of my doctor, I decided to give up smoking. 4.公园位于现成的正中央。 The park is located right in the center of town. 5.这所大学提供了我们所需的所有材料和设备。 The university provides all the materials and facilities we desire. Unit2 1.警察们正忙着填写关于这场事故的各种表格。 The policemen are busy filling out forms about the accident. 2.我想在还车之前把油箱加满。 I want to fill up the fuel tank before returning the car. 3.如果你要投诉，最好遵循正确的程序。 If you want to make a complaint, you’d better follow the correct procedure. 4.要不是约翰帮忙，我们绝不会这么快及完成实验。

大学体验英语综合教程3选词填空答案及翻译

Unit 1 1. The company will spend $6 million on sales as well as the development of new products. 2. We all agreed on our basic aims, but when we got down to items it became more complicated. 3. Nowadays, not only demand the high quality of the products but also their after-sale services. 4. The movie star was caught in the act of shoplifting but was after he left his ID to the supermarket. 5. The soldiers pretended to run away and the enemy, in pursuing them, were finally . 6. As a of being in hospital, Shelly decided to become a nurse. 7. The village from the outside for three days because of the flood. 8. After the Second World War, millions of people were left homeless; so t he government decided to give to housing. 9. In many shops, shopping bags are provided for the customers' . 10. With a tearful love story and two famous stars, the movie has all the for a success. Anwser: 1.strategies, 2.specific, 3.consumers, 4.released, 5.trapped, 6.consequence, 7.was isolated, 8.priority, 9.convenience, 10. Elements Unit 2 1. The theories of relativity have made changes in our views of the universe. 2. That is our proposal, and no other changes will be considered. 3. The forest fire was found to be by a cigarette end. 4. The speaker had noticed that his topic wasn't popular with the audience, so he quickly ended his speech. 5. I've no with people who are always complaining of their misfortune. 6. I have never imagined that I would be the object of such . 7. The doctors tried to her that she didn't need to be in depression about her health. 8. The police asked him to describe the accident in every . 9. The quality guarantee and good after-sale services will certainly meet with positive from the consumers. 10. The story "Harry Potter" the imagination of children throughout the world. Anwser: 1.fundamental, 2.ultimate, 3.sparked, 4.apparently, 5.patience, 6.curiosity, 7.convince, 8.detail, 9.responses, 10. (has) stirred Unit 3 1. I don't think that the amount of studying you did in high school would be sufficient to good marks in university. 2. Because of the impact of poor sales in other Asian countries, there has been a decrease in house sales in China this year. 3. Some young people find computer games so that they can hardly pull themselves away to tend to other matters. 4. The victim was able to give a description of the drunken driver, which was rather helpful to the police. 5. Some non-governmental organizations are planning a public to awaken people to the problem of noise pollution.

大学体验英语综合教程2(第三版)翻译答案

大学体验英语综合教程2（第三版）翻译答案 Unit 1 A 1. 任何年满18岁的人都有资格投票。(be eligible to, vote) Answer:Anyone over the age of 18 is eligible to vote. 2. 每学期开学前，这些奖学金的申请表格就会由学校发给每一个学生。(apply for, scholarship) Answer:A form to apply for these scholarships is sent by the university to every student before the start of every semester. 3. 遵照医生的建议，我决定戒烟。(on the advice of) Answer:On the advice of my doctor, I decided to give up smoking. 4. 公园位于县城的正中央。(be located in) Answer:The park is located right in the center of town. 5. 这所大学提供了我们所需的所有材料和设备。(facilities) Answer:The university provides all the materials and facilities we desire. B 1. 他们花了多年的时间寻找内心的平静，但是收效甚微。(search for) Answer:They spent many years searching for peace of mind, but with little success. 2. 这种新药的成功研制已经使许多疾病的治疗发生了根本性的变革。(revolutionize) Answer:The successful development of the new drug has revolutionized the treatment of many diseases. 3. 由于这个国家的经济不景气，这家公司濒于破产。(on the edge of) Answer:The company is on the edge of bankruptcy due to the economic depression in the country. 4. 大学毕业后他成为了一名护士。他认为护士这一职业可能很有发展前途。(rewarding) Answer:He became a nurse after college. He thought nursing could be a very rewarding career. 5. 他像往常一样在文件上签了名。(just as) Answer:He signed his name on the paper just as he has always done it. Unit 2 A 1. 警察们正忙着填写关于这场事故的各种表格。(fill out) Answer:The policemen are busy fi lling out forms about the accident. 2. 我想在还车之前把油箱加满。(fill up, fuel tank) Answer:I want to fi ll up the fuel tank before returning the car. 3. 如果你要投诉，最好遵循正确的程序。(follow the procedure) Answer:If y ou want to make a complaint, you’d better follow the correct procedure. 4. 要不是约翰帮忙，我们绝不会这么快就完成实验。(without) Answer:We couldn’t have finished the experiment so soon without John’s help.

随机过程复习题(含答案)

随机过程复习题 一、填空题： 1．对于随机变量序列}{n X 和常数a ，若对于任意0>ε，有 ______}|{|lim =<-∞ >-εa X P n n ，则称}{n X 依概率收敛于a 。 2．设}),({0≥t t X 是泊松过程，且对于任意012≥>t t ， ，则 15 92}6)5(,4)3(,2)1({-??= ===e X X X P , 618}4)3(|6)5({-===e X X P 15 32 62 32 92! 23!2)23(!23}2)3()5({}2)1()3({}2)0()1({} 2)3()5(,2)1()3(,2)0()1({} 6)5(,4)3(,2)1({----??=???==-=-=-==-=-=-====e e e e X X P X X P X X P X X X X X X P X X X P 66 218! 26}2)3()5({}4)3(|6)5({--===-===e e X X P X X P 3．已知马尔可夫链的状态空间为},,{321=I ，初始分布为),,(4 1 2141， ?????? ?? ????????? ?=434 103 13131043 411)(P ，则167)2(12=P ，161}2,2,1{210====X X X P

???????? ?????? ????=48 31481348 436133616367 164167165)1()2(2P P 16 7 )2(12=P 16 1 314341}2|2{}1|2{}1{}2,1|2{}1|2{}1{} 2,2,1{12010102010210=??=================X X P X X P X P X X X P X X P X P X X X P 4．强度λ的泊松过程的协方差函数),min(),(t s t s C λ= 5．已知平稳过程)(t X 的自相关函数为πττcos )(=X R ， )]()([)(π?δπ?δπω-++=X S 6. 对于平稳过程)(t X ，若)()()(ττX R t X t X >=+<，以概率1成立，则称)(t X 的自相关函数具有各态历经性。 7.已知平稳过程)(t X 的谱密度为2 3)(2 42 ++=ωωωωS ，则)(t X 的均方值= 2 121- 222 2221 1221)2(22211122)(+??-+??=+-+= ωωωωωS ττ τ-- -=e e R X 2 12 1)(2