西安交大考试卷(理论力学英文)
流体力学试题(英文版)
第 5 页
西安交通大学本科生课程考试试题标准答案与评分标准(A)
课程名称:
流体力学 (英文)
课时:
64
考试时间: 2007
年 1 月 23 日
Part Ⅰ Concepts
1. Fill in the blank (10×1.5)
①; Continuum ② surface , body; ③ Lagrangian, Euler; ④ gage, absolute; ⑤ compression, increase; ⑥ longer-thiner; ⑦ inviscid; ⑧ 2300 or 2100, diameter; ⑨ velocity; ⑩ major, minor 说明:1)若用中文回答,答案正确不扣分 2)英文单词不唯一,酌情判分
∑Q = ∑Q
in
out
)
6. Suppose that mathematical function
f ( x, y )=2 x 2 + xy 2 y 2
is
stream function for a tow-dimensional flow field,please solve the following problems (1) Is this flow filed potential or irrotational flow (势流或无旋流动)? (2) If fluid density ρ = 1.12kg/m3 and at point (1m,-2m) flow pressure is 4800pa,try to obtain the pressure at point (-2m,1m). (15)
2. Expressions and physical significance
西交大少年班英语考试试题
西交大少年班英语考试试题本试卷分第Ⅰ卷（选择题）和第Ⅱ卷（非选择题）两部分。
第Ⅰ卷1至7页。
第Ⅱ卷8－9页，共100分。
考试时间120分钟。
注意：第一卷的试题答案请答在答题卡上，答在试卷上一律无效。
第Ⅰ卷（选择题共65分）第一部分：知识运用（共两节，35分）第一节单项选择 (共15小题；每小题1分, 共15分)从A、B、C、D四个选项中，选出可以填入空白处的最佳选项，并在答题卡上将该项涂黑。
1. In the USA, _____ students not only need good grades, but also need to get _____ social experience.A. the; theB. a; aC. /; /D. the; a2. Have you read the paper today? Train ______ are going up again, and they’re so expensive already!A. feesB. faresC. pricesD. tickets3. —Thank you for your good advice on how to plan for the future, Mrs. Williams.—__________.A. It doesn’t matterB. With pleasureC. My pleasureD. My happiness4. The latest online survey, _____ by , found that more than 73 per cent of young people want to work as civil servants.A. to be carried outB. being carried outC. carried outD. having been carried out5. He was robbed in a lonely street last night, but _______ he didn’t have any money or credit cards in his wallet at that time.A. fortunatelyB. happilyC. finallyD. eventually6. With homeschooling growing quickly in the United States, nobody is quite sure exactly how many American children_____ at home.A. being taughtB. taughtC. are being taughtD. are teaching7. The police suspected him of carrying drugs so they _____ his bag, but they found nothing.A. went onB. went inC. went acrossD. went through8. Abdulla has enjoyed his life in China, but he says that sometimes he wishes Chinese _____ more about his homelandin Africa.A. had knownB. knowC. knewD. have known9. I will take my daughter with me when I _________ ShangHai.A. go toB. will go toC. have been toD. have gone to10. When I saw Mary, she ________ the violin in the sitting room.A. is playingB. playsC. was playingD. played11. I didn't want either of _______ shirts and asked the salesman to show me_________.A. those, anotherB. two, the otherC. all, the othersD. that, others12. _____________ wants the book may have it.A. WhoB. WhoeverC. AnyoneD. The person13. Is this the museum ___________ your brother worked 2 years ago?A. thatB. whichC. whereD. the one14. I was doing my homework __________ he was playing the computer game.A. whenB. whileC. beforeD. as15. She had escaped, __________the ring had fallen off and been damaged in the great heat of the fire.A. soB. orC. butD. and第二节完形填空 (共20小题；每小题1分，共20分)阅读下面短文，掌握其大意，从每题所给的A、B、C、D四个选项中，选出最佳选项，并在答题卡上将该项涂黑。
陕西西安交通大学研究生入学考试英语真题
陕西西安交通大学研究生入学考试英语真题考试时间：2022年5月15日考试地点：陕西西安交通大学一、听力测试（共30分）本部分共分为三个小节，每个小节均包含一道长对话和两篇短文。
请听清题目后，从A、B、C三个选项中选择正确答案。
小节一：1. What does the woman want to do?A. Get a refund for the book.B. Buy another book.C. Borrow a book from the library.2. What does the man suggest the woman do?A. Take a taxi to the office.B. Drive to the office herself.C. Take a bus to the office.小节二：3. Why is the man disappointed?A. He didn't pass the exam.B. His presentation was not successful.C. The project deadline was postponed.4. What does the woman advise the man to do?A. Review the material again.B. Ask the professor for help.C. Attend more seminars.小节三：5. What does the man offer to do for the woman?A. Help her with her homework.B. Drive her to the airport.C. Accompany her to the concert.6. What does the woman think of the concert?A. She is excited about it.B. She heard it is not worth attending.C. She hasn't made up her mind yet.二、阅读理解（共40分）阅读下列短文，根据短文内容从A、B、C三个选项中选择正确答案。
西安交大英语试题及答案
西安交大英语试题及答案一、听力理解（共20分）1. What is the woman going to do this evening?A. Go to a concertB. Visit her parentsC. Do some shopping2. How much will the man pay for the tickets?A. $10B. $20C. $303. What does the woman think about the weather?A. It is too hotB. It is just rightC. It is too cold4. Why does the man refuse the woman's invitation?A. He has to workB. He is not interestedC. He has another appointment5. What is the man's opinion about the movie?A. It is too longB. It is very interestingC. It is boring二、阅读理解（共30分）Passage 1In recent years, the number of people choosing to study abroad has increased significantly. According to a survey conducted by the Ministry of Education, the number ofstudents going abroad for higher education has risen by 15% compared to last year. This trend is expected to continue as more students are attracted by the quality of education andthe diverse cultural experiences offered by foreign universities.6. What is the main reason for the increase in students studying abroad?A. Better job opportunitiesB. Quality of educationC. Lower tuition fees7. By how much has the number of students studying abroad increased?A. 5%B. 10%C. 15%Passage 2The use of renewable energy sources has become a hot topic in recent years. Solar and wind power are two of the mostpopular renewable energy sources. Solar energy is clean and abundant, but its efficiency is affected by weather conditions. Wind power, on the other hand, is also clean and has the advantage of being more consistent, although it requires large wind turbines that can be expensive to install.8. What is the main advantage of solar energy?A. It is consistentB. It is clean and abundantC. It is cheap to install9. What is a disadvantage of wind power?A. It requires large wind turbinesB. It is affected by weather conditionsC. It is not clean三、完形填空（共20分）One day, a farmer was walking in his field when he found a snake. The snake was injured, so the farmer decided to help it. He took the snake home and cared for it until it was healthy again. The snake was very grateful and promised to repay the farmer's kindness.10. What did the farmer find in his field?A. A rabbitB. A snakeC. A bird11. Why did the farmer take the snake home?A. To eat itB. To sell itC. To help it12. What did the snake promise to do?A. To leave the farmer's houseB. To repay the farmer's kindnessC. To harm the farmer四、翻译（共15分）13. 请将以下句子从英语翻译成中文："The rapid development of technology has changed the way we live and work."14. 请将以下句子从中文翻译成英语：“随着互联网的普及，越来越多的人开始在线购物。
2024西安交大少年班英语试题
2024西安交大少年班英语试题全文共6篇示例，供读者参考篇1Title: 2024 Entrance Exam for Xi'an Jiaotong University Junior ClassHi guys! Welcome to the 2024 entrance exam for the Xi'an Jiaotong University Junior Class! I'm super excited to see all of you here today. Are you ready to show off your English skills? Let's get started!Section 1: Reading ComprehensionRead the passage below and answer the questions that follow:The sun was shining brightly in the sky as Sally walked to school. She was excited because today was the day of the big science fair. Sally had been working on her project for weeks and couldn't wait to show it off to her classmates.Question 1: Why was Sally excited?Question 2: What had Sally been working on for weeks?Question 3: What was happening at school today?Section 2: VocabularyMatch the following words with their correct definitions:1. Excited2. Project3. Classmatesa. Feeling or showing happiness and enthusiasmb. A task or piece of workc. People in the same school or groupSection 3: WritingWrite a short paragraph about your favorite subject in school and why you enjoy it. Make sure to use at least three adjectives to describe your feelings towards the subject.I hope you all do your best on the exam! Good luck, everyone!篇2Title: 2024 Xi'an Jiaotong University Junior Program English TestHey guys! Welcome to the 2024 Xi'an Jiaotong University Junior Program English Test! Today, we are going to test your English skills in a fun and exciting way. Make sure to read the questions carefully and take your time to answer them. Let's get started!Part 1: Vocabulary1. What is the opposite of 'happy'?a) Sadb) Angryc) Excited2. What does 'delicious' mean?a) Tastyb) Grossc) Boring3. Choose the correct word to complete the sentence: "I ____ my homework yesterday."a) Dob) DidPart 2: Grammar4. Fill in the blanks with the correct form of the verb:I _________ (play) basketball every day.5. Choose the correct form of the verb:She _________ (is, are) a doctor.6. Turn the following sentence into a question:Tom likes ice cream.Part 3: Reading ComprehensionRead the following passage and answer the questions below:Tom and Mary went to the park. They played on the swings and had a picnic. They ate sandwiches and drank juice. After that, they played soccer with their friends.7. What did Tom and Mary do at the park?a) Played video gamesb) Had a picnicc) Studied8. What did they eat during the picnic?b) Sandwichesc) Burgers9. Who did Tom and Mary play soccer with?a) Their parentsb) Their friendsc) StrangersGreat job, guys! You made it through the 2024 Xi'an Jiaotong University Junior Program English Test. Keep practicing your English skills and you'll do amazing! Good luck!篇3Title: My Amazing Experience at the 2024 Xi'an Jiaotong University Junior Class English ExamHey guys! Today I want to tell you all about my awesome experience at the 2024 Xi'an Jiaotong University Junior Class English Exam. It was super fun and I learned a lot of new things!First up, we had a listening section where we had to listen to a speech and answer some questions. It was a bit tricky at first, but I tried my best and managed to get most of the answersright. The speaker had a really cool accent, so it was a bit hard to understand at times, but I think I did pretty well overall.Next, we had a reading section where we had to read a story and answer some questions about it. The story was super interesting and had a lot of twists and turns. I really enjoyed reading it and answering the questions. It was like solving a mystery!After that, we had a grammar section where we had to fill in the blanks with the correct words. I was a bit nervous about this part because grammar is not my favorite subject, but I pushed through and gave it my best shot. I think I did pretty well, but I guess I'll have to wait and see what my score is.Overall, I had an amazing time at the 2024 Xi'an Jiaotong University Junior Class English Exam. I learned a lot of new things and had a lot of fun. I can't wait to see how I did and I'm already looking forward to the next exam!篇4Hello boys and girls! Today we are going to have a super fun English test for the Xi'an Jiaotong University Junior Class of 2024! Are you ready? Let's get started!Part 1: Vocabulary1. Match the words with their meanings:a) Elephantb) Bananac) Bookd) Car1) A large animal with a big trunk2) A yellow fruit that monkeys love to eat3) Something you read to learn new things4) A vehicle that takes you from place to place2. Fill in the blanks with the correct words:I like to ____ to school every day.My favorite fruit is ____.I read a ____ about dinosaurs yesterday.The ____ is the largest land animal.Part 2: Reading ComprehensionRead the following passage and answer the questions:Tom and Lisa went to the zoo on Saturday. They saw lions, tigers, and bears. Tom's favorite animal was the elephant, while Lisa loved the monkeys. They also saw a bird show where colorful parrots flew around the audience.1. Where did Tom and Lisa go on Saturday?2. What animals did they see at the zoo?3. What was Tom's favorite animal?4. What did they see at the bird show?Part 3: WritingImagine you are a superhero. What powers do you have? Write a short paragraph describing your powers and how you use them to help others.Remember to write neatly and check your spelling! Good luck on your test, everyone! Have fun learning English!篇52024 Xi'an Jiaotong University Junior Class English TestPart 1 Listening Comprehension1. Listen to the conversation and answer the following questions:a. What is the girl's favorite subject?b. Where is the boy's school located?c. What does the boy want to do this weekend?2. Listen to the passage and fill in the blanks:My name is Lily and I live in a small (1) ________ in the countryside. I love (2) ________ because I can see beautiful flowers and (3) ________ animals. My favorite animal is the (4) ________ because they are so fluffy and cute.3. Listen to the phone call and choose the correct answer:What does the girl want to buy at the store?A. MilkB. BreadC. EggsPart 2 Reading ComprehensionRead the passage and answer the questions below:My Summer VacationLast summer, my family and I went on a trip to the beach. We stayed in a cozy beach house and spent our days swimming,building sandcastles, and collecting seashells. It was the best vacation ever!1. Where did the family stay during their summer vacation?2. What activities did they do at the beach?3. How would you describe the vacation in one word?Part 3 WritingWrite a paragraph about your favorite hobby and why you enjoy it. Be sure to include details and examples to support your answer.Remember to use complete sentences and proper grammar in your writing. Good luck on your test!篇6Title: My Experience at the 2024 Xi'an Jiaotong University Junior Class English ExamHi everyone! I want to share with you all about my experience at the 2024 Xi'an Jiaotong University Junior Class English exam. It was so much fun and I learned a lot of cool things!First, we had a listening test where we had to listen to different conversations and answer questions about them. It was a bit tricky because the speakers talked really fast, but I tried my best to understand. Then, we had a reading test where we had to read a passage and answer questions about it. Some of the words were new to me, but I used my vocabulary skills to figure them out.Next, we had a writing test where we had to write a short paragraph about our favorite hobby. I chose to write about playing soccer because I love running around and kicking the ball. It was so much fun to write about something I'm passionate about!Finally, we had a speaking test where we had to talk about our dream job. I want to be an astronaut when I grow up, so I practiced talking about exploring space and discovering new planets. It was a bit nerve-wracking to speak in front of everyone, but I did my best.Overall, the English exam was a great experience and I had so much fun. I can't wait to see my results and hopefully, I'll get into the 2024 Xi'an Jiaotong University Junior Class! Thanks for reading about my experience!。
西安交大英语考试《英语1(新录)》考前复习题
大学英语一（新录）复习资料答案一、交际英语 Communicative English（本大题共10小题，每题2分，共20分）1. —Can I get you a cup of tea?— ______A_________________.A. That’s very kind of you.B. With pleasure.C. You can, please.D. Thank you for the tea.2. — Who is that speaking?— This is Tom ___C___________.A. speaksB. spokeC. speakingD. saying3. — I was worried about my math, but Mr. Brown gave me an A.— B .A. Don’t worry about it.B. Congratulations! That’s difficult course.C. Mr. Brown is very good.D. Good luck to you!4. — What can I do for you?— A .A. I want a kilo of pears.B. You can do in your own way.C. Thanks.D. Excuse me. I’m busy.5. — ________D____________— He teaches physics at a school.A. What does your father want to do?B. Who is your father?C. How is your father?D. What is your father?6. — __________A__________— Well, they got there last Wednesday. So about a week.A. How long have your parents been in Paris?B. When did your parents arrive at Paris?C. Did your parents arrive at Paris last Wednesday?D. When will your parents go to Paris?7. — Mike injured his leg playing football yesterday.— Really? ______C_________.A. Who did that?B. What’s wrong with him?C. How did that happen?D. Why was he so careless?8. — My birthday is tomorrow.— __________C_________.A. Ho, I have no idea.B. I’m glad you like it.C. Many happy returns of the day!D. You must be very happy.9. — Are you getting a new flat this year?— __________D_____________. I can’t afford to pay my bills, let alone a new flat.A. Without question.B. Are you sure?C. Good idea!D. You must be joking10. — Please help yourself to some seafood.— ________D_______.A. No, I can’t.B. Sorry, I can’t help.C. Well, seafood don’t suit.D. Thanks, but I don’t like seafood.二、词汇语法 Grammar and Vocabulary （本大题共15小题，每小题2分，共30分）11. Stocks are regarded as a good long-term ____C__________.A. involvementB. installmentC. investmentD. instrument12.Many __A___ shops will be forced to close if the new supermarket is built.A. localB. broadC. generalD. public13.There's a lot of public ____A_____ about dangerous toxins recently found in food.A. concernB. conceptC. conductD. conflict14. Students should be encouraged to use _D__ Internet as ____ resource.A. /; aB. /; theC. the; theD. the; a15. One potential danger is __A___ the information could be used by others to your disadvantage.A. thatB. whatC. itD. which16. This fire extinguisher is to be used only in case of ______D________.A. urgencyB. crisisC. immediacyD. emergency17. She’s part of a team of scientists who are ___C______ upon cancer research.A. workedB. arrangedC. engagedD. involved18. The ____B_______ doesn’t cover household items.A. intelligenceB. insuranceC. instanceD. insult19. Please prepare the medicine for me according to this A .A. prescriptionB. descriptionC. inscriptionD. subscription20. Tourism has ________D______ agriculture as the nation’s main industry.A. recalledB. reckonedC. redirectedD. replaced21. My fish was delicious but Charles' beef had almost no _____C______.A. sauceB. smellC. flavorD. appetite22. Contrary to expectations, the film was successful _____D____ when it was released.A. currentlyB. fastC. readilyD. instantly23. Oil is an important ______B____ material which can be processed into many different products, including plastics.A. uncoveredB. rawC. freshD. crude24. The girl is _______B___ of a film star.A. somebodyB. somethingC. anybodyD. anything25. I had my meals _____C____ when I was ill in bed with a bad cold.A. to bringB. bringC. broughtD. bringing三、阅读理解 Reading Comprehension（本大题共15小题，每小题2分，共30分）Passage 1Sixteen-year-old Maria was waiting in line at the airport in Santo Domingo. She was leaving her native country to join her sister in the United States. She spoke English very well. Though she was very happy she could go abroad, she was feeling sad at leaving her family and friends. As she was thinking all about this, she suddenly heard the airline employee asking her to pick up her luggage and put it on the scales (称). Maria pulled and pulled. The bag was too heavy and she just couldn't lift it up. The man behind her got very impatient. He, too, was waiting to check in his luggage."What's wrong with this girl?" He said, "Why doesn't she hurry up?" He moved forward and placed his bag on the counter, hoping to check in first. He was in a hurry to get a good seat.Maria was very angry, but she was very polite. And in her best English she said, "Why are you so upset? There are enough seats for everyone on the plane. If you are in such a hurry, why can't you give me a hand with my luggage?"The man was surprised to hear Maria speak English. He quickly picked up her luggage and stepped back.Everyone was looking at him with disapproval. (224 words)26. Maria's story happened D .A. when she was leaving AmericaB. on her way back to Santo DomingoC. before she left the USAD. when she arrived at the airport27. You believe that the work of the airline employee mentioned in the story is toC at the airport.A. help carry people's luggageB. ask people to pick up the luggageC. check people's luggageD. take care of people's luggage28. "Why are you so upset?" Maria said to the man. She wanted to tell him that he should not beC .A. surprisedB. sadC. unhappyD. sorry29. "Everyone was looking at him with disapproval. " This sentence means that the people around feltD .A. worried about MariaB. worried about the manC. sorry for Maria's mannersD. sorry for the man's manners30. The author mentioned Maria's age at the beginning of the story in order to show thatA .A. she was young but behaved properlyB. she would not have left home aloneC. everyone around her was wrongD. it was not good that nobody offered to help herPassage 2In the United States, it is not customary to telephone someone very early in the morning. If you telephone him early in the day, while he is shaving or having breakfast, the time of the call shows that the matter is very important and requires immediate attention. The same meaning is attached to telephone calls made after 11:00 p. m. If someone receives a call during sleeping hours, he assumes it's a matter of life or death. The time chosen for the call communicates its importance. In social life, time plays a very important part. In the U.S.A. guests tend to feel they are not highly regarded if the invitation to a dinner party is extended only three or four days before the party date. But it is not true in all countries. In other areas of the world, it may be considered foolish to make an appointment too far in ad-vance because plans which are made for a date more than a week away tend to be forgotten. The meaning of time differs in different parts of the world. Thus, misunderstandings arise between people from different cultures that treat time differently. Promptness is valued highly in American life, for example. If people are not prompt, they may be regarded as impolite or not fully responsible. In the U.S. no one would think of keeping a business associate waiting for an hour, it would be too impolite. A person who is 5 minutes late, will say a few words of explanation, though perhaps he will not complete the sentence. (260 words)31. What is the main idea of this passage?BA. It is not customary to telephone someone in the morning and in sleeping hours in the U.S.B. The role of time in social life over the world.C. If people are not prompt, they may be regarded as impolite or not fully responsible in the U.S.D. Not every country treats the concept of time as the same.32. What does it mean in the passage if you call someone during his or her sleeping hours?BA. A matter of work.B. A matter of life or death.C. You want to see him or her.D. You want to make an appointment with him or her.33. Which of the following time is proper if you want to make an appointment with your friend?BA. at 7:00 am.B. at 4:00 pm.C. at the midnight.D. at 4:00 am.34. Which of the following statements is true according to the passage?DA. In the U.S.A. guests tend to feel they are highly regarded if the invitation to a dinner party is extended only three or four days before the party date.B. There is no misunderstanding arising between people from different cultures about the concept oftime.C. It may be considered foolish to make an appointment well in advance in the U.S.A. .D. Promptness is valued highly in American life.35. From the passage we can safely infer that B .A. it's a matter of life or death if you call someone in day time.B. the meaning of time differs in different parts of the world.C. it makes no difference in the U.S. whether you are early or late for a business party.D. if a person is late for a date, he needn't make some explanation.Passage 3The greatest recent changes have been in the lives of women. During the twentieth century there was an unusual shortening of the time of a woman’s life spent in caring for children. A woman who got married at the end of the 19th century would probably have been in her middle twenties, and would be likely to have seven or eight children, of whom four or five lived till they were five years old. By the time the youngest was fifteen, the mother would have been in her early fifties and would expect to live a further twenty years, during which custom, chance and health made it unusual for her to get paid work. Today women get married at a younger age and have fewer children. Usually a woman’s youngest child will be fifteen when she is forty-five and is likely to take paid work until retirement at sixty. Even while she has the care of children ,her work is lightened by household appliances（家用电器）and convenience foods. This important change in women’s way of life has only recently begun to have its full effect on women’s economic position. Even a few years ago most girls left school at the first opportunity and most of them took a full-time job. However, when they got married, they usually left work at once and never returned to it. Today the school-leaving age is sixteen, many girls stay at school after that age, and though women tend to get married young, more married women stay at work at least until shortly before their first child is born. Many more return afterwards to a full-time or part-time job. Such changes have led to a new relationship in marriage, with both husband and wife accepting a greater share of the duties and satisfaction of family life, and with both husband and wife sharing more equally in providing the money and running the home, according to the abilities and interest of each of them.36. We are told that in an average family about 1890___D_____.A. many children died before they were fiveB. the youngest child would be fifteen years younger than the oldestC. seven of eight children lived to be more than fiveD. the child death rate was rather high37. When she was over fifty, the late 19th century mother____D____.A. would expect to work until she diedB. was usually expected to take up paid employmentC. would be healthy enough to take up paid employmentD. was unlikely to find a job even if she is now likely38. Many girls, the passage says, are now likely to ___D_____.A. get married so that they can get a jobB. leave school as soon as they canC. give up their jobs for good after they are marriedD. continue working until they are going to have a baby39. According to the passage, it is now quite usual for women to __C______.A. stay at home after leaving schoolB. marry men younger than themselvesC. start working again later in lifeD. get married while still at school40. The best title for this passage is _____A_________.A. Great Changes in Women’s LifeB. 19th-Century FamilyC. Modern Girls’ ChoiceD. Equal Duties in Family Life四、完形填空 Cloze（本大题共10小题，每小题1分，共10分)There were once three sons of a wealthy businessman. 41 they met, the two eldest, who were twins,42 to quarrel about which of them should be his father's heir (继承人) . The youngest, who was not43 ambitious (野心勃勃的), took no part in their argument. As soon as they left home, the father arranged for an adequate income to be provided for 44 of them, but insisted that apart from this they were to be financially self-supporting. The 45 twin, who had the advantage of good looks and a striking personality, decided that he would take up the stage 46 a career. He 47 a small repertory company, acted in minor parts, was always unpunctual (不准时) at rehearsals and was accordingly 48 with his fellow-actors. He earned little and so had to live mainly on his allowance. He occasionally thought of 49 his profession, but always put off 50 a decision, and he became increasingly bored and disillusioned.B41A. whatever B. whenever C. wherever D. howeverB42A. are used B. Used C. using D. are usingC43A. at least B. at most C. in the least D. in the mostC44A. every B. All C. each D. noneD45A. first B. older C. younger D. elderB46A. is B. as C. be D. /A47A. joined B. attended C. went D. joined inB48A. popular B. unpopular C. welcome D. unwelcomeD49A. living B. turning C. ending D. changingA50A. making B. make C. decide D. deciding五、作文 Essay Writing（本大题共10分）You are required to write a letter on the topic Food Safety with no less than 80 words.假如几天前你的邻居从某超市买回食品吃，吃后食物中毒，肚子痛，被送往医院治疗后脱险。
理论力学英文版试卷A(附参考答案)
XXX工业大学20XX ～20XX 学年第XX学期期末考试试卷学院_________________ 班级__________ 姓名__________ 学号___________ 《理论力学》课程试卷B（附参考答案）Instructor: Yijian(Time: 2 Hours) Course Code:题号 1 2 3 4 5 6 总得分题分20 15 15 15 15 20得分1．Choose the correct answers with proper justification (10×2=20, 20%)1 2 3 4 5 6 7 8 9 10D D C A B B A C B C(1) For vector addition you have to use law.A) Newton’s Second B) the arithmetic C) Pascal’s D) the parallelogram(2) A particle moves along a horizontal path with its velocity varying with time as shown in theright figure. The average acceleration of the particle is _________.A) 0.4 m/s2 → B) 0.4 m/s2 ←C) 1.6 m/s2 → D) 1.6 m/s2 ←(3) If the position of a particle is defined by r = [(1.5t2 + 1) i + (4t – 1) j] (m), its speed at t=1 sis .A) 2 m/s B) 3 m/s C) 5 m/s D) 7 m/s(4) As shown in the right figure, the speed of block B is .A) 1 m/s B) 2 m/sC)4 m/s D) None of the above.(5) If the path function of a particle is s = 10 sin 2θ, the acceleration, a,is . (Noting that θ=ωt, ω is the angular velocity at time t).A) 20 a sin2θB) 20 a cos2θ-40ω2sin2θC) 20 a cos2θD) -40 a sin2θ(6) As shown in the right figure, the velocity of plane A with respect to plane B is .A) (400 i+ 520 j) km/hrB) (1220 i - 300 j) km/hr3C) (-181 i- 300 j) km/hrD) (-1220 i + 300 j) km/hr(7) If the pendulum is released from the horizontal position, the velocity of its bob in thevertical position is .A) 3.8 m/sB) 6.9 m/sC) 14.7 m/sD) 21 m/s(8) If a slender bar rotates about end A, its angular momentum with respect to A is .A) (1/12) m l2 ωB) (1/6) m l2 ωC) (1/3) m l2 ωD) m l2 ω(9) The tangential acceleration of an object .A) represents the rate of change of the velocity vector’s direction.B) represents the rate of change in the magnitude of the velocity.C) is a function of the radius of curvature.D) Both B and C.(10) Point A on the rod has a velocity of 8 m/s to the right. Where is the instantaneous center (IC)for the rod? .A) Point A. B) Point B. C) Point C. D) Point D.Determine the magnitude of the resultant force and its direction measured counterclockwise from the positive x axisSolution:Using the vector analysis, we have the x - and y -components of forces 600N and 800N as ()()()o 1o 122600N cos303003519.6N 600N sin 30300N 0800N x y x y F F F F ====-=-== (2%)Hence, the force vectors are obtained as111222519.6300800x y x y F F F F =+=-=+=F i j i j F i j j(4%)According to the vector addition rule, the resultant force is expressed in the vector form ()()121212519.6500R x x y y Rx Ry F F F F F F =+=+++=+=+F F F i j i j i j(5%)So, the magnitude and direction of the resultant force are obtained as ()()()()2222o519.6500721.10N519.6arccos arccos 43.90721.1R Rx RyRx R F F F F F θ=++=⎛⎫⎛⎫=== ⎪ ⎪⎝⎭⎝⎭(4%)The tower is held in place by three cables. If the force of each cable acting on the tower is shown, determine the magnitude and coordinate direction angles α, β, γ of the resultant force. Take x =20 m, y =15 m.Solution:Going from D to A , one must travel {-24k } m, then {20i } m and finally {15j } m. Thus, the unit vector for rope DA is (2%) ()222201524m 20152434.6634.6634.66201524m A DA Ar +-===+-++-i j k r u i j k (){}201524400N 230.81173.11276.98N 34.6634.6634.66A A DA F ⎛⎫==+-=+- ⎪⎝⎭F u i j k i j kGoing from D to B , one must travel {-24k } m, then {-6i } m and finally {4j } m. Thus, the unit vector for rope DB is (2%) ()()2226424m 642425.0625.0625.066424m BDB Br -+-===-+--++-i j k r u i j k (){}6424800N 191.54127.69766.16N 25.0625.0625.06B B DB F ⎧⎫==-+-=-+-⎨⎬⎩⎭F u i j k i j kGoing from D to C one must travel {-24k } m, then {-18j } m and finally {16i }m. Thus, the unit vector for rope DC is (2%) ()()2228912171717161824mC DC C r ===--++-r u i j k(){}8912600N 282.35317.65423.53N 171717C C DC F ⎧⎫==--=--⎨⎬⎩⎭F u i j k i j kHence, the resultant force is (5%){}321.6216.851466.67N R A B C =++=--F F F F i j kThe magnitude and the coordinate direction angles of R F are (4%)oo1501.7N321.62arccos arccos 77.631501.790.64arccos arccos 90.641501.7167.6arccos arccos 167.61501.7R Rx R Ry R RzRF F F F F F F αβγ==⎛⎫⎛⎫===⎪ ⎪⎝⎭⎝⎭⎛⎫⎛⎫=== ⎪ ⎪⎝⎭⎝⎭⎛⎫⎛⎫===⎪ ⎪⎝⎭⎝⎭oDetermine the horizontal and vertical components of reaction at the pin A and the reaction on the beam at C .Solution:(1) Free-body diagram (5%)We draw a free-body diagram for the overhanging beam as below:(2) Equations of equilibrium (5%)Consider the counterclockwise moment of the force positive. According to the free-body diagram, we have x- and y-component equations and moment about point A of equilibrium as follows()()()()o o o 0,cos 4500,sin 454kN 00,sin 45 1.5m 4kN 3m 0x Ax C y Ay C A C F F F F F F M F =+==+-==-=∑∑∑ After solving, we have (5%)11.31kN,8kN,4kN Ax Ay C F F F ==-=-The negetive sign indicates that the direction sence is oppisite to that shown in the free-body diagram.A projectile is launched from point A with the initial conditions shown in the figure. Determine the slant distance s which locates the pointB of impact. Calculate the time of flight t .Solution:Establish a fixed x,y coordinate system (in the solution here, the origin of the coordinate system is placed at A ). Apply the kinematic relations in x and y-directions. Motion in x-direction: (4%)()o 00ocos400120m/s cos40B A x AB A AB B ABx x v t x v t x t =+=+=+Motion in y-direction: (5%)()()()2o 20o 2211120m/s sin 402210120m/s sin 409.81kg/s 2B A y AB AB A AB ABB AB ABy y v t gt y t gt y t t =+-=+-=+-Noting that (2%)()o 800m tan 20B B y x =--, o /sin 20B s y =After solving, we obtain the slant distance s and the flight time t as follows (4%) 279.8m, 3.04AB s t t s ===The rod AB has a mass of 10 kg. Piston B is attached to a spring of constant k = 800 N/m. The spring is un-stretched when θ= 0°. Neglect the mass of the pistons. Determine the angular velocity of rod AB at θ= 0° if the rod is released from rest when θ= 30°.Solution:Initial position (2%)Final position (2%)(1) Potential Energy:(5%)Let’s put the datum in line with the rod when θ= 0°. Then, the gravitational potential energy and the elastic potential energy will be zero at position 2. => V2 = 0Gravitational potential energy at position 1: - (10)( 9.81) ½ (0.4 sin 30)Elastic potential energy at position 1: ½ (800) (0.4 sin 30)2So, V1 = - 9.81 J + 16.0 J =6.19 J(2) Kinetic Energy:(5%)The rod is released from rest from position 1 (so v G1 = 0, ω1 = 0). Therefore, T1 = 0. At position 2, the angular velocity is ω2 and the velocity at the center of mass is v G2.Therefore,T2 = ½ (10) (v G2)2 + ½ (1/12)(10)(0.42) (ω2)2At position 2, point A is the instantaneous center of rotation. Hence, v G2 = r ω = 0.2 ω2 . Then, T2 = 0.2 ω22 + 0.067 ω22 = 0.267 ω22(3) conservation of energy equation (6%)Now apply the conservation of energy equation and solve for the unknown angular velocity, ω2. T1 + V1 = T2 +V20 + 6.19 = 0.267ω22 + 0 => ω2 = 4.82 rad/s。
英语(三) 20年 西交大考试题库及答案
一、单选题(100分）1、一Please help yourself to the seafoodA、No. I can't B. Sorry. I can't help C,. Well, seafood don't suit for. D、Thanks, but]don't like the seafood正确答案：D学生答幸：D.'2、一It's a good idea. But who's going to一I think John and Peter will A、carry out B、get through C.. take in D、set aside正确答案：A学生答幸：A了the plan?3.. The young actor who had been thought highly of ________ to be a great disappointment A、turned up B. turned out C.. turned down D、turned in正确答案：B字生答案：4.. Before the final examination. some students have shown_of tension, They even have troublein sleeping A. anxiety B. marks c、signs D、remarks正确答案：C学生答幸：C了5、It is said that A. quite a lot B. quite a few C. quite a bit D、quite a little正确答案：B学生答幸：B了boys in your school like playing football in their spare time. though others prefer basketball6. The problem is not A、hardly B. almost C. nearly D、scarcely正确答案：B学生答幸：B 了so easy as you think. It's far from being settled7、一How do you do? Glad to meet youA. Fine. How are you?B. How do you do? Glad to meet you, tooC. How are you? Thank you! D、Nice. How are you?正确答案：B学生答幸：B了8. I was giving a talk to a large group of people, the same talk! A. was giving B. am giving C. had given D. have given正确答案：C学生答幸：C了to half a dozen other groups before9'Will you_ A、do B. make c、bring D、give正确答案：A学生答幸：A了me a favor. please?10' A.her and then try to copy what she doesMind See Stare at Watch、、』8 CD正确答案：D学生答幸：O了11、一Hi, is Mary there, please?A、Hold on. I'll get her B. No, she isn't here C.飞5, she lives here D、Yes. what do you want?正确答案：A掌生答幸：Ae12、一!t's time to tidy your room. Harry! -See the tidy room, Mum!_ A、Something B. Anything c、Everything D、Nothing正确答案：C学生答幸：C'is where it should be13、一We are going to have a singing party tonight. Would you like to join us?A、!'m afraid not. because ! have to go to an important meeting B. Of course not, ! have no ideac、No. ! can't D、That's all set正确答案：A学生答幸：Ae14、The manager will not A、have B. let c、agree D、a的。
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课程名称 理论力学A1（英） 2003 —2004学年第 1 学期 学 号 开 课 系 工程力学系 年级 本科二年级 姓 名 任课老师 柳葆生 评分 规定：仅允许携带电子词典、计算器和教师提供的课程总结
1. Member BD exerts on member ABC a force P directed along line BD.
Knowing that P must have a 360-N vertical component, determine (a) the
magnitude of the force P, (b) its horizontal component. (零件BD 对零件
ABC 沿BD 线施加一个力P ，已知P 的垂直分量为360-N ，计算（a ）
力P 的大小，（b ）力P 的水平分量
)
2. Two forces P and Q are applied as shown to an aircraft connection. Knowing that the connection is in equilibrium and that P = 250 N and Q = 325 N, determined the magnitude of the forces exerted on the rods A and B. (如图所示，两个力P 和Q 施加于一个飞机连接器。
已知连接器处于平衡状态，并且P = 250 N 和Q = 325 N ，确定施加于连杆A 和B 上力的大小)
3. A 150 N force, acting in a vertical plane parallel to the yz plane, is
applied to the 200 mm long horizontal handle AB of a socket wrench.
Replace the force with a equivalent force-couple system at the origin O
of the coordinate system. (一个150 N 的力，作用在平行于yz 平面的
垂直平面内，施加于一个套筒扳手200 mm 长的水平手柄上。
用一个
在坐标原点O 的等效力－力偶系统代替这一力
)
4. Knowing that the tension in wire BD is 1500 N, determine the
reaction at the fixed support C of the frame shown. (已知拉索BD 中
的张力为1500 N ，确定如图示在框架固定支撑端C 的约束反力)
5. Determine the forces in each member of the truss shown. State whether
each member is in tension or compression. (确定图示桁架中每个杆件中的
力。
说明每个杆件受拉力或压缩力)
6. A uniform crate of mass 30 kg must be moved up along the 15º
incline without tipping. Knowing that the force P is horizontal,
determine (a) the largest allowable coefficient of static friction between
the crate and the incline, (b) the corresponding magnitude of the force P.
(一个匀质的30 kg 货箱必须被沿15º斜面上移，并不发生倾翻。
已
知力P 为水平方向，确定：
（a ）在货箱和斜面间所允许的最大静摩擦系数，（b ）相对应力P 的大小)
7. The acceleration of a point P moving in a plane is given by j )5t 4(i t 3a 2r r r ++=2s /m , where t is the time in seconds. When t = 2, the position and velocity are respectively )j 33.26i 12(r r +m and j 21i 10r r +s /m . Determine the position and velocity at t = 1. (点P 在平面中移动，其加速度表达式为j )5t 4(i t 3a 2r r r ++=2s /m ，其中t 为以秒为单位的时间。
当t = 2, 其位移和速度分别为)j 33.26i 12(r r +m 和 j 21i 10r r +s /m ，确定t = 1时的位移和速度)
8. A car leaves a motorway at point A with a speed of 100
km/h and slows down at a uniform rate. Five seconds later,
as it passes B, its speed is 50 km/h (see Figure). The radius
of curvature of the exit road at B is 110 m. The mass of the
car is 1500 kg. Find (a) the acceleration of the car at B and
(b) the total force exerted by the car on the road at B. (一辆
轿车在点A 以100 km/h 的速度离开高速公路，并均匀减
速。
5秒钟后，通过B 时，其速度为50 km/h （见图）。
求
出（a ）轿车在B 点的加速度，（b ）在B 点轿车对地面所
施加的总力)。