第一二次作业(学生)
水力学1第二次作业
p1 = 6.78m ρg p1K = 66.4 KN / m
2
2-6 在水平安装的文丘里流量计上,直接用水 银差压计测出水管与喉部压差h为20cm,已知 水管直径d1为15cm,喉道直径d2为10cm,当不 计水头损失时,求通过流量Q.
2-6 解:根据文丘里流量计流量公式 Q = K 12.6h
R = Rx 2 + Ry 2 = 3.567 KN
解得 Ry = 2.153KN
合力与水平方向的夹角 tgβ =
R R
y
= 0.76 β = 37 8'
x
作用于弯管上的作用力为3.567kN 方向与R 3.567kN, 水作用于弯管上的作用力为3.567kN,方向与R相反
2-13 一平板闸门宽 为2m,当通过流量 为 一平板闸门宽b为 ,当通过流量Q为 8m3/s时闸前水深 为4m,闸孔后收缩断面水深 时闸前水深H为 , 时闸前水深 hc为0.5m,求作用于平板闸门上的动水总压力 , 不计摩擦力). (不计摩擦力).
umax 2 2 u = 2 (r0 r ) r0
2-1 - 解:= 2 (r0 r ) = 15 r r0 9
15 2 由流量公式得Q = ∫ udA = ∫ (15 r )2π rdr A A 9 = 211.95cm3 / s
F1 F0 X
Y
Ry F2
FP = ρ QV0 sin 2 α
2-22 解: (1)沿y方向列动量方程 ) 方向列动量方程
0 Ry = 0 ρ QV0 sin α 得 Ry = ρ QV0 sin α
Ry在射流方向上的压力为 在射流方向上的压力为
R = Ry sin α = ρ QV0 sin α
（精选）数字图形创意设计、在线作业
数字图形创意设计第一次作业（第一二章）一. 单选. （共 9 小题，63 分）1. 下列文件类型中，不属于点阵图格式的是（）。
A .*. JpgB .*. bmpC .*.aiD .*. tif学生答案: C正确答案: C分数：7 得分：72. 查看绘图时，显示全部对象的快捷键是（）。
A .F2B .F9C .F3D .F4学生答案: D正确答案: D分数：7 得分：73. 点阵图的分辩率常用单位为ppi，它是指每个（）长度单位内所包含的像素数值。
A .毫米B .英寸C .厘米D .米学生答案: B正确答案: B分数：7 得分：74. 如果您打开的文件中正缺少某几种字体,CorelDRAW会（）。
A .自动替换B .出现对话框让您选择C .空出字体D .临时替换学生答案: B正确答案: B分数：7 得分：75. 属性栏、泊坞窗、工具栏和工具箱在屏幕上可以随时打开、关闭、移动吗（）。
A .可以B .不可以C .属性栏可以D .工具栏可以学生答案: A正确答案: A分数：7 得分：76. 以下关于页面背景说法正确的是（）。
A .只能是位图B .只能是纯色C .可以嵌入文档D .不能被打印学生答案: C正确答案: C分数：7 得分：77. 将矢量图转换为位图后，其文件可能会（）。
A .体积变大B .体积变小C .体积不变D .可以再原样转为矢量图学生答案: A正确答案: A分数：7 得分：78. 位图的最小单位是（）。
A .1/2个像素B .1/4个像素C .1 个像素D .1/8个像素学生答案: C正确答案: C分数：7 得分：79. CorelDRAW可以生成的图像类型是（）。
A .位图B .矢量图C .位图和矢量图D .栅格图学生答案: B正确答案: B分数：7 得分：7二. 多选. （共 1 小题，7 分）10. 根据计算机对图形的处理原理及应用的软件和使用的环境的不同，静态数字图形大致可以分为（）。
第二十二章 一元二次方程课时作业(学生用)
二十二章一元二次方程的解法一一元二次方程()课时训练一、填空题（每空4分，共32分）1．方程2y2－3=2y，化成一元二次方程的一般形式是，其中二次项系数是，一次项是，常数项是．2．若方程2x2+mx=3x+2中不含x的一次项，则m= ．3．已知方程：①2x2－3=0；②1x2－1=1；③12y－13y2+1=0；④ay2+2y+c=0；⑤(x+1)(3－x)=x2+5；⑥x2－x=0，其中是一元二次方程的有．(填序号).4．关于x的方程x2－2x+m=0的一根为0，则m= ;若方程有一根为－1，则m= 。
二、选择题（每小题4分，共24分）5．下列方程中是一元二次方程的为( )A．2x2－1x+1=0 B．2x2－5xy+6y2=0C．x2=x D．x2+x=y6．一元二次方程3x2－5x=7的一次项系数和常数项分别是( ) A．－5，7 B．－5，－7C．－5，0D．3，－57．方程(m－1)x2+mx+1=0是关于x的一元二次方程，则m的值为( ) A．任何实数B．m≠0C．m≠1D．m≠－18．当a为任意实数时，下列方程是一元二次方程的有( ) A．ax2+12x－5=3x2－1B．(a2－1)x2+ax+a=0C．(a2+1)x2+(a+1)x－ax＝aD．a2x2－(2a－l)x－5=09．下列x的各组取值是方程(x－1)(x－8)=－12的根是( ) A．x=2或x=3 B．x=3或x=4C．x=4或x=5 D．x=5或,x=6 10．在关于x的方程(m2－4)x3+(m－2)x2－mx+m+1 =0中，要使这个方程为一元二次方程，则m的值为( ) A．任何实数B．±2 C．2 D．－2 三、解答题(11题16分，l2题20分，13题8分，共44分)11．把下列关于x的一元二次方程化为一般式，并写出二次项系数、一次项系数及常数项．(1)(x－5)(2x－1)=3 (2)(x+8)2=4x+(2x－1)2(3)(x－1)2=(2x+31)2(4)(3x－1)2=1.9612．指出下列方程是关于x的一元二次方程的条件(1)2ax(x－1)－5=－3ax(2)mx2+2mx―m―x2=－1(3)(k2+1)x2+3x－2=0(4)x2+3ax+ay－5=013．已知关于x的方程x2+ax－9=0的一根为－2，求a的值，14．(附加题)根据下列题意，列出一元二次方程，并将它化为一般式：(10分)在一块长为30m.宽为20m的矩形土地中间，种植面积为551m2的矩形绿地，在绿地四周铺设宽度相等的鹅卵石道路，求鹅卵石道路的宽？（设鹅卵石道路的宽都为x m）参考答案一、填空题1．答案：2y2－2y－3=02－2－3 2．答案：3 3．答案：①③⑤⑥4．答案：0－3二、选择题5．答案：C 6．答案：B 7．答案：C 8．答案：C 9．答案：C 10．答案：D 三、解答题11．解答：(1)2x2－11x+2=0 2 －11 2(2)解：3x2－16x－63=0 3－16－63(3)6x2+x－2=061－2(4)2x2+(22+1)x+3=0 2 22+1 3 12．解答：(1)原方程化为：2ax2+ax－5=0，a≠0(2)原方程化为：(m－1)x2+2mx－m+1=0．m≠1(3)k为任何数(4)a=013．解答：把x=－2代入x2+ax－9=0，得4－2a－9=0 ∴a=－2．514．解答：(30－2x)(20－2x)=551，化成一般形式为：4x2－100x+49=0二十二章一元二次方程的解法二直接开平方法()课时训练一、填空题(每小题5分，共30分) 1．方程x2=36的解为。
2011年12月考试大学英语(1)第二次作业
2011 年 12 月考试大学英语（1）第二次作业一、单项选择题（本大题共 60 分，共 60 小题，每小题 1 分）1. The opportunities for people to meet outside ( ) a lot ( ) the weather.A. based…onB. take…toC. depend…onD. involve…in2. Chinese ( ) are not written with an alphabet, making it very hard for a lot of Westerners to remember.A. namesB. foodsC. characteristicsD. characters3. My American friend knows my problem because I ( ) my ideas with him.A. have changedB. changedC. have exchangedD. exchanged4. Chinese New Year ( )( ) the Spring Festival, as it is the first day of the spring season according to the Chinese lunar calendar.A. is known asB. is called asC. is names asD. is regarded as5. Great as Newton was, many of his ideas ( ) today and are being modified by the work of scientists of our time.A. are to challengeB. may be challengedC. have been challengedD. are challenging6. The more attention you put in your study, ( ) the study will be.A. more easierB. the more easierC. the easierD. easier as7. Of course, our ( ) relationship is very good. But business is business.A. personnelB. personalC. privateD. public8. It is in this university ( ) Prof. Jackson established his famoustheory.A. whichB. thatC. whereD. what9. Will you tell me how I can see the ( ) manager, please?A. personalB. privateC. personnelD. public10. His success was due to ( ) he had been working hardA. that the factB. that the factC. which the fact of11. I don’t know how to express my thanks. -- ( )A. it’s my pressureB. The pleasure is mine.C. Nice to meet.D. No, not.12. I’d better check in my luggage quickly ( ) I’d miss my flight.A. andB. soC. orD. to13. Look at the muddy road here. It ( )( ) last night.A. could have rainedB. must have rainedC. would have rainedD. should have rained14. I had booked my flight over the telephone. ( )A. 书本B. 预定C. 错过D. 杂志15. I don't think that I shall fail. But if I ( ), I would try again.A. should failB. would failC. failedD. had failed16. The doctor took my temperature and ( ) to my heart.A. listensB. will listenC. has listenedD. listened17. I’d rather ( ) your advice yesterday.A. not to takeB. not takenC. not takeD. not taking18. The stadium will have been built by the time she ( ) from Japan.A. returnsB. will returnC. returnD. returned19. If only we ( ) your suggestion last week!A. would takeB. takeC. tookD. had taken20. How many hours will you ( )( ) the community service a week?A. spend forB. adjust toC. apply toD. devote to21. I have collected lots of stamps, ( ) are given by my friends.A. most of themB. most of whichC. most of thatD. most of what22. If you meet some new words, just ( ) the dictionary.A. look upB. consultC. conductD. look for23. ( ) the project one month earlier, they burst into a big laughter.A. AccomplishedB. Being accomplishedC. AccomplishingD. Having accomplished24. —Excuse me, can you tell me where your general manager is? —Yes, of course, ( ).A. here does our general managerB. here our generalC. manager comes our general managerD. here comesE. here comes our general manager25. She is so busy and can’t ( ) any t ime.A. repairB. spreadC. spearD. spare26. Tim is so ( )that he never changes his mind.A. kindB. gentleC. stubbornD. panic27. ( ) greeting, would you please give me an example to use in English?A. Spoken ofB. Speaking ofC. Talked ofD. Talking of28. He walked ( )south ( ) the river and stopped for a rest.A. as far…asB. so much…asC. so…asD. such…as29. The whole book totally ( ) 13 chapters.A. made up ofB. consisted ofC. made up withD. consisted in30. I decided to take ( ) piano playing as my hobby.A. offB. toC. inD. up31. This boy is his mother's ( ) for he never did anything right.A. hopeB. despairC. despiteD. expectation32. He decided to ( ) more time to accompany his children after the death of his wife.A. set asideB. set outC. set backD. set off33. It’s important that this problem ( ) before any others.A. is settledB. be settledC. was settledD. had been settled34. Malaysia is a country that ( )( ) in the manufacture of rubber products.A. specializesB. producesC. turnsD. makes use35. If possible, I’d like the ( ) flight for I’m in a hurry.A. directB. commuteC. transferD. stop36. Keep on working, ( ) you will be successful.A. actuallyB. punctuallyC. graduallyD. eventually37. I am sorry ( ).A. to keep you waitingB. to make you waitingC. to have kept you waitingD. to have made you waiting38. I’m sorry; you are not ( ) t he gust list.A. withB. onC. overD. at39. The government asked the people to be sure to avoid ( ) any water which had not been boiled.A. drinkingB. have drunkC. to drinkD. not to be drunk40. Knowledge we gained in school is very important, ( ) we will depend in the future.A. in whichB. of whichC. to whichD. on which41. As long as I work hard, my dream of ( ) to Harvard Universitywill come true.A. being acceptedB. being receivedC. being admiredD. being admitted42. He has made himself ( )with us.A. acquaintB. acquaintedC. acquaintingD. to acquaint43. No sooner ( ) stepped out of the hall than it began to rain.A. had weB. have weC. did weD. do we44. Is it the first time you ( ) to Chongqing?A. cameB. have comeC. had comeD. would come45. I’ve been wrestling with Chinese ( ) for ten years now.A. now and thenB. off and onC. for and consD. up and down46. I’ve been wrestling with Chinese ( ) for ten years now.A. now and thenB. off and onC. for and consD. up and down47. That young man still denies ( )- the fire behind the store.A. to startB. to startingC. having startedD. having been started48. You’re such a hardworking student, you ( ) the praise.A. reserveB. deserveC. conserveD. preserve49. How many hours will you ( )( ) the community service a week?A. spend forB. adjust toC. apply toD. devote to50. The teacher ( ) us so much homework that almost every one of us felt discouraged.A. assignedB. deliveredC. distributedD. scattered51. Next month, the company will ( ) me to the Shanghai branch.A. exchangeB. transmitC. transferD. remove52. Please take good care of yourself. We wish you a quick( ).A. discoveryB. returnC. turnD. recovery53. Their handshake should be firm, and they’ve both ( ) their names and jobs.A. mentionedB. askedC. talkedD. remembered54. He was so ( ) in his work that he didn’t notice me entering the room.A. concentratedB. focusedC. absorbedD. attracted55. How should we ( ) the poster to make it more attractive.A. demonstrateB. describeC. decorateD. decrease56. Is Thanksgiving Day a ( ) holiday for America people?A. singleB. uniqueC. particularD. uniform57. ( ) a life may be too hard to the little girl.A. ThisB. ThatC. SoD. Such58. The ( )high for tomorrow is forty-five degrees Fahrenheit.A. predictB. predictedC. predictingD. prediction59. Music ( ) us a lot of pleasure.A. givingB. giveC. givesD. gived60. The basketball game come to us ( ) from New York.A. liveB. aliveC. livelyD. living二、阅读理解单项选择题（本大题共 40 分，共 4 小题，每小题 10 分）1. Gift giving customs vary greatly from country to country. What is considered appropriate in France may be entirely inappropriate in Japan.To the Japanese, gift giving is a way of communicating respect, friendship, and appreciation. When meeting with a group of Japanese professionals, be sure to give higher quality gifts to those with more senior rank within the company. Always present the gift with two hands. This is also true with presenting business cards.Gift giving in Australia, Canada, United States, European countries is rarely expected. While seen as a nice gesture, it is more important to avoid gifts that will be regarded as bribes( 行贿 ). Small gifts such as pens, business diaries, and mementos with company logos are usually sufficient. It is important to avoid highly personal gifts such as clothing. When visiting the home of a colleague from one of these countries, it is normally appropriate to present a gift to the hostess.In conclusion, international gif t giving rules varies from country to country. We can’t list all customs here. Before presenting a gift to an important foreign colleague, do a little research on the customs, it will help you more.(1). What is the mainly idea of the passage? ( )A. Gift giving in eastern countries. ?B.Gift giving professions.C.Gift giving in western countries.D.Gift giving customs.(2). Which of the following behaviors is not correct in Japan according to the passage? ( )A. Giving the same quality of gifts to all the people.B.Using two hands to send gifts or cards.C.Following the general rules of Japanese.D.Never preparing any gifts.(3). Which of the following gifs is preferred in European countries? ( )A. Money.B.Business diaries.C.ClothingD.Ties(4). We may prepare a gift to the hostess when visiting the home EXCEPT in ( )A. JapanB.AustraliaC.CanadaD.USA(5). The rules of gift giving varies greatly, what shall we do before present a gift? ( )A. Preparing the expensive gift.B.Avoid highly personal gifts.C.Do research on the customs.D.Ask our guests beforehand2. Hotlines have become common in Chin Some radio broadcasting stations use hotlines to encourage the listeners to take part in the talk shows.That''s a good idea Yet, the fact is, some people do nothing but break the whole programme. Some people know little about the topic under discussion. Sometimes they do not even know what the host ( 主持人 ) is talking about. So the host has to tell the caller what the show is about. Usually the caller will ask a few questions which express hope and show his ignorance ( 无知 }. Then the host has to answer and explain —— how silly this is! It wastes a lot of time. It seems that some people phone the hotlines in fun. They just want to let the listeners hear them. They don''t care what the topic is, whether they themselves are interested in or how silly they appear to be.I think that it''s necessary for radio stations to improve the hotline programmes. In my opinion, if a caller doesn''t know what is going on, the operator should not let the callers take part in it(1). The sentence "some people do nothing but break the whole programmes" may tell us that ( )A. radio stations use hotlinesB.in a wrong way it is a factC.it is a good ideaD.some people have unclear thoughts(2). According to the passage, which of the following is not true? ( )A. Some people do not know what the host is talking about.B.Some people know little about the topic under discussion.C.Some people do not know what the show is about.D.The writer tells us that the host is silly.(3). The host has to answer and explain ( )A. for the host works hardB.because of the caller's ignoranceC.for the host likes talking to the callerD.because a lot of questions are raised by the caller(4). The passage doesn't tell us ( )A. that some listeners phone the hotline in funB.that some people just want to be heard by othersC.that some people who don't care what the topic is realize that they appear to be sillyD.what the hotlines programmes are(5). The word "operator" in the last sentence refers to the( )A. hostB.listenerC.doctor D.both A and B3. There has been a great deal of research into the art of negotiation, and, in particular, into what makes a “good negotiator”.One point most researchers seem to agree on is that good negotiators try to create a harmonious atmosphere at the start of a negotiation.They make an effort to establish a good rapport with their opposite member, so that there will be a willingness — on both sides — to make concessions, if this should prove necessary.Good negotiators generally wish to reach an agreement which meets the interests of both sides. They therefore tend to take a long-term view, ensuring that the agreement will improve, at least not harm, their relationship with the other party. On the other hand, a poor negotiator tends to look for immediate gains, forgetting that thereal benefits of a deal may come much later.Skillful negotiators are flexible. They do not “lock themselves”into a position so that they will lose face if they have to compromise. They have a range of objectives, thus allowing themselves to make concessions, for example, “I aim to buy this machine for £2 000” and not “I must buy it for £2 000”. Poor negotiators have limited objectives, and may not even work out a “fall-backposit ion”.Successful negotiators do not want a negotiation to break down. If problems arise, they suggest ways of resolving them. The best negotiators are persuasive, eloquent people, who select a few key arguments and repeat them.Finally, it is essential to be a good listener and to check frequently that everything has been understood by both parties.(1). The best title for the passage is ( )A. Benefits on Both SidesB.Art of NegotiationC.Skills of CommunicationD.How to Be a Good Negotiator(2). Negotiators’ good rapport can make it easy for negotiators ( )A. to make them fully understoodB.to make necessary concessionC.to create a positive environmentD.to increase negotiators’ status(3). If we understand that the some real benefits of a deal may come much later ( )A. we will take a long term view in the negotiationB.we will pay more attention to the benefits on both sidesC.we will try much harder to improve the agreementD.we will try to change the relationship with the other party(4). Many poor negotiators may not make any concession for themselves in that ( ).A. they are afraid of losing faceB.they have no clear objectivesC.they are not flexibleD.they are not skillful(5). Good negotiators are usually very persuasive and eloquent in order to ( )A. work out ways to resolve problemsB.make sure that everything is understoodC.have better communication with their partnersD.avoid the breakdown of the negotiation4. Nellie Melba was Australia''s "Queen of Opera". She was born in 1861 and her real name was Helen Porter Mitchell. She grew up in musical family. When she was 20, Helen Mitchell married the manager of a Queensland sugar farm. But she was not happy and the next years she went back to Melbourne to continue her music and singing lessons. She wanted to make a name for herself as an opera singer.In 1886 she went to London. But no one seemed interested in this young unknown singer from Australia. She went to Paris to have lessons from a well-known teacher. In December 1886 she gave a concert in which she used the name "Nellie Melba" in honor of Melbourne, her hometown.Nellie Melba was soon a star. She sang in London, Europe, Russia and America. She was paid well every time she sang. In 1902 she returned to Melbourne. The city was decorated and thousands of people waited in the streets to wave and cheer as she drove by. From then on she divided her time between London and Australia. During World War I she sang in many concerts in Australia to raise money.In 1918 Nellie Melba was made a Dame of the British Empire.(1). Nellie Melba's parents probably were ( ).A. musicianB.engineers C.pianistsD.violinists(2). She went to London because she ( ).A. wanted to make moneyB.wanted to leave her parentsC.hated her husbandD.wanted to be a great singer(3). She became famous in her ( ).A. thirtiesB.twentiesC.fiftiesD.forties(4). Which of the following is true? She ( )A. loved Melbourne, but the people there did not love herB.didn't love Melbourne, but the people there loved herC.didn't love Melbourne, and neither did the people there D.loved Melbourne, and the people there loved her(5). What do you suppose "a Dame of the British Empire"? ( )A. A talented woman.B.A woman singer.C.A woman spy.D.A respected woman.(6). What does the author wants to tell us? ( )A. A Canadian girl tries record flyingB.A Canadian girl flew with her fatherC.Two Youngest pilotsD.A Two-week flight答案：一、单项选择题（60 分，共 60 题，每小题 1 分）1. C2. D3. C4. A5. C6. B7. B8. B9. C 10. B 11. B 12. C 13. C14. B 15. A 16. D 17. C 18. A 19. D 20. D 21. B 22. B 23. D 24. D 25.D 26. C 27. B 28. A 29. C 30. D 31. B 32. A 33. B 34. A 35. A 36. D37. C 38. B 39. A 40. D 41. D 42. B 43. A 44. B 45. B 46. B 47. C 48.B 49. D 50. A 51.C 52.D 53. A 54. C 55. C 56. B 57. D 58. B 59. C60. A二、阅读理解单项选择题（40 分，共 4 题，每小题 10 分）1.(1). D (2). A (3). B (4). A (5). C2.(1). D (2). D (3). B (4). D (5). A3.(1). D (2). B (3). A (4). C (5). D4.(1). A (2). D (3). B (4). D (5). D (6). A。
2023年春江苏开放大学机械设计第二次作业
2023年春江苏开放大学机械设计第二次作业试题列表判断题题型：判断题客观题分值2分难度：一般得分：21两齿轮啮合的中心距偏离标准中心距时，其传动比仍保持不变。
A正确B错误学生答案：A老师点评：题型：判断题客观题分值2分难度：一般得分：22带传动多用于机械中要求传动平稳、传动比要求不严格、中心距较大的低速级传动。
A正确B错误学生答案：B老师点评：题型：判断题客观题分值2分难度：一般得分：23松键连接是依靠上、下工作面传递转矩的。
A正确B错误学生答案：B老师点评：题型：判断题客观题分值2分难度：一般得分：24渐开线的形状取决于压力角的大小。
A正确B错误学生答案：B老师点评：题型：判断题客观题分值2分难度：一般得分：25V带传动一般是多根带同时工作，因而与平带相比，其优点之一是传动中，某根带疲劳损坏后可以单独更换。
A正确B错误学生答案：B老师点评：题型：判断题客观题分值2分难度：一般得分：26两轴相交成90°时，可采用蜗杆传动。
A正确B错误学生答案：B老师点评：题型：判断题客观题分值2分难度：一般得分：27用展成法加工齿轮时，只要刀具与被加工齿轮的模数和压力角相同，不管被加工齿轮的齿数是多少，都可以用同一把刀具来加工。
A正确B错误学生答案：A老师点评：题型：判断题客观题分值2分难度：一般得分：28工程实践中螺纹连接多采用自锁性好的三角形粗牙螺纹。
A正确B错误学生答案：A老师点评：题型：判断题客观题分值2分难度：一般得分：29链传动在一定条件下，链节距越大，承载能力越高，但运动平稳性差，动载荷和噪声越严重。
A正确B错误学生答案：A老师点评：题型：判断题客观题分值2分难度：一般得分：210使用开口销和止动垫片等元件进行防松属于利用附加摩擦力防松。
A正确B错误学生答案：B老师点评：单选题题型：单选题客观题分值3分难度：中等得分：31正常标准直齿圆柱齿轮的齿根高（）。
A与齿顶高相比，可能大也可能小B与齿顶高相等C比齿顶高小D比齿顶高大学生答案：D老师点评：题型：单选题客观题分值3分难度：中等得分：32结构简单、承载不大，但要求同时对轴向与周向都固定的联接应采用（）。
电大《C语言知识学习程序设计》第1,2,3,4次作业任务及答案解析
第一次作业一、写出下列每个程序运行后的输出结果1. #include<stdio.h>void main(){int x=5;switch(2*x-3){case 4:printf("%d ",x);case 7:printf("%d ",2*x+1);case 10:printf("%d ",3*x-1);break;default:printf("%s ","default\n");}printf("%s\n","switch end.");}2. #include<stdio.h>void main(){int i,s=0;for(i=1;i<=6;i++)s+=i*i;printf("s=%d\n",s);}3. #include<stdio.h>void main(){int i,s1=0,s2=0;for(i=0;i<10;i++)if(i%2)s1+=i;else s2+=i;printf("%d %d\n",s1,s2);}4. #include<stdio.h>void main(){int n=10,y=1;while(n--){y++;y++;}printf("y=%d\n",y);}5. #include<stdio.h>void main(){int f,f1,f2,i;f1=f2=1;printf("%d %d ",f1,f2);for(i=3;i<=10;i++){f=f1+f2;printf("%d ",f);if(i%5==0)printf("\n");f1=f2;f2=f;}printf("\n");}6. #include<stdio.h>#include<math.h>void main(){int i,n;for(n=2;n<=20;n++){int temp=(int)sqrt(n);//sqrt(n)求出n的平方根并取整for(i=2;i<=temp;i++)if(n%i==0)break;if(i>temp)printf("%d ",n);}printf("\n");}7. #include<stdio.h>#include<math.h>const int M=20;void main(){int i,c2,c3,c5;c2=c3=c5=0;for(i=1;i<=M;i++){if(i%2==0)c2++;if(i%3==0)c3++;if(i%5==0)c5++;}printf("%d %d %d\n",c2,c3,c5);}8. #include<stdio.h>#include<math.h>const int M=20;void main(){int i,s;for(i=1,s=0;i<15;i++){if(i%2==0 || i%3==0)continue;printf("%d ",i);s+=i;}printf("%d\n",s);}参考答案：1、答案：11 14 switch end.2、答案：s=91.3、答案：25 20.4、答案：y=21.5、答案：1 1 2 3 58 13 21 34 556、答案：2 3 5 7 11 13 17 197、答案：10 6 48、答案：1 5 7 11 13 37第二次作业一、根据下列每个题目要求编写程序1．编写一个函数，函数头格式为“void fun4(char *a , int b[])”，分别求出由字符指针a所指向的字符串中包含的每种十进制数字出现的次数，把统计结果保存在数组b的相应元素。
江苏省江阴市夏港中学2024-2025学年九年级上学期第一次作业反馈数学试题
江苏省江阴市夏港中学2024-2025学年九年级上学期第一次作业反馈数学试题一、单选题1．下列方程中，是一元二次方程的是（ ） A ．2x +3x +y ＝0B ．x +y +1＝0C ．2x ＝0D ．2x 1x++5＝02．已知O e 的半径为3，当5OP =时，点P 与O e 的位置关系为（ ） A ．点P 在圆内B ．点P 在圆外C ．点P 在圆上D ．不能确定3．把方程2230x x +-=配方后，可变形为（ ） A ．()223x +=B ．()214x +=C ．()212x +=D ．()212x +=-4．下列说法中，正确的是（ ） A ．同弦所对的圆周角相等 B ．三角形的外心到三个顶点的距离相等 C ．长度相等的两条弧是等弧D ．任意三点确定一个圆5．如图，AB 是O e 的直径，弦CD AB ⊥于点,2,8E BE CD ==，则O e 半径为( )A ．2B ．3C ．5D ．86．如图，在直角坐标系中，OAB ∆和OCD ∆是位似图形，O 为位似中心，若A (1,1)，B (2,1)，C (3,3)，那么点D 的坐标是（ ）A ．（4，2）B ．（6，3）C ．（8，4）D ．（8，3）7．如图，AB 是O e 的直径，点,,C D E 在O e 上，若100C ∠=︒，则E ∠的度数为( )A ．10︒B ．20︒C ．30︒D ．40︒8．“读万卷书，行万里路”我校为了丰富学生的阅历知识，坚持开展课外阅读活动，学生人均课外阅读量从七年级的每年50万字增加到九年级的每年80万字．设该校七至九年级人均阅读量年均增长率为x ，则可列方程为（ ） A ．250(1)80x += B ．250(1%)80x +=C ．250(12)80x +=D ．25050(1)50(1)80x x ++++=9．我国古代数学家赵爽（公元3~4世纪）在其所著的《勾股圆方图注》中记载过一元二次方程（正根）的几何解法，以方程22350x x +-=即(2)35x x +=为例说明，记载的方法是：构造如图，大正方形的面积是2(2)x x ++．同时它又等于四个矩形的面积加上中间小正方形的面积，即24352⨯+，因此5x =．则在下面四个构图中，能正确说明方程：2280x x --=解法的构图是( )A ．B ．C ．D ．10．如图，ABC V 是等腰直角三角形，90ABC ∠=︒，4AB =，点D ，E 分别在AC ，BC 边上运动，连结AE ，BD 交于点F ，且始终满足AD =，则下列结论：①AE BD =②135DFE ∠=︒；③ABF △面积的最大值是4；④CF 的最小值是其中正确的是（ ）A ．①③B ．①②④C ．②③④D ．①②③④二、填空题11．若△ABC 与△A 1B 1C 1相似，且相似比为1：3，则△ABC 与△A 1B 1C 1的周长比为． 12．已知关于x 的一元二次方程280x x c -+=有一个根为5，则c 的值为．13．若矩形的长和宽是方程()20960x m m x -+<≤=的两根，则矩形的周长为．14．直角三角形的两直角边长分别为6和8，那么这个三角形的外接圆半径等于． 15．如图，正方形ABCD 四个顶点都在⊙O 上，点P 是在弧BC 上的一点（P 点与C 点不重合），则CPD ∠的度数是．16．如图， AB CD 、是O e 的直径，弦CE AB ∥，若75AOC ∠=︒，则»CE的度数是．17．如图，在正方形ABCD 中，AB =2，F 是BD 边上的一个动点，连接AF ，过点B 作BE ⊥AF 于E ，在点F 变化的过程中，线段DE 的最小值是．18．如图，点D 在射线BC 上移动（不含B 点），Rt Rt ABC ADE V V ∽，90ACB ∠=︒，10AB =，8BC =，若 3.6CDE S =△时，则BD =．三、解答题19．用适当的方法解方程： (1)2220x x --=； (2)2250x x --=； (3)()241160x --=； (4)()()3222x x x -=-；20．已知关于x 的一元二次方程()22210x m x m +-+=．(1)若方程有实数根，求m 的取值范围；(2)若方程的两实数根分别为1x ，2x ，且满足221214x x +=．求m 的值． 21．如图，BAD CAE ∠=∠，B D ∠=∠．(1)ABC V 与ADE V 相似吗？为什么？(2)如果2AB AD =，4BC =，那么DE 的长为多少？22．如图，在平面直角坐标系中，已知ABC V 三个顶点的坐标分别是()2,2A -，()0,4B ，()4,4C ．、(1)以点O 为位似中心，将ABC V 缩小为原来的12得到111A B C △，请在x 轴下方画出111A B C △；点(),P a b 为ABC V 内的一点，则点P 在111A B C △内部的对应点1P 的坐标为_______． (2)ABC V 外接圆的圆心坐标为_______，外接圆的半径是_______．23．如图，ABC V 中，90C ∠=︒，3AC =，4BC =，以点C 为圆心、CA 的长为半径的圆与AB 、BC 分别相交于点D 、E ．(1)用直尺和圆规作出劣弧AD 的中点F （保留作图痕迹，不写作法）； (2)求AD 的长．24．已知△ABC ，以AB 为直径的⊙O 分别交AC 于D ，BC 于E ，连接ED ，若ED =EC （1）求证：AB =AC ；（2）若AB =4，BC =CD 的长．25．社区利用一块矩形空地建了一个小型的居民停车场，其布局如图所示．已知停车场的长为52米，宽为28米，阴影部分设计为停车位，要铺花砖，其余部分是等宽的通道．已知铺花砖的面积为640平方米．(1)求通道的宽是多少米？(2)该停车场共有车位64个，据调查分析，当每个车位的月租金为200元时，可全部租出；当每个车位的月租金每上涨10元，就会少租出1个车位，当每个车位的月租金上涨多少元时，停车场的月租金收入为14400元？（涨价后月租金不能超过300元）26．定义：若关于x 的一元二次方程20(a 0)++=≠ax bx c 的两个实数根分别为1x ，()212x x x <，分别以1x ，2x 为横坐标和纵坐标得到点()12,M x x ，则称点M 为该一元二次方程的衍生点． (1)直接写出方程220x x +=的衍生点M 的坐标为______； (2)已知关于x 的方程222(1)20x m x m m -+++=．①求证：不论m 为何值，该方程总有两个不相等的实数根； ②求该方程衍生点M 的坐标；③已知不论(0)k k ≠为何值，关于x 的方程20x bx c ++=的䘕生点M 始终在直线2(4)y kx k =-++上，求b ，c 的值．27．如图，(1)如图1，在矩形ABCD 中，CE BD ⊥于点H ，交AD 于点E ．求证：CE CDBD BC=； (2)如图2，在四边形ABCD 中，90,4,9,7A B AD BC CD ∠=∠=︒===．E 是边AB 上的一动点，过点C 作CG ED ⊥，交ED 的延长线于点G ，交AD 的延长线于点F ．试探究CFDE是否为定值？若是，请求出CFDE的值；若不是，请说明理由； (3)如图3，在Rt ABD △中，90BAD ∠=︒，将ABD △沿BD 翻折得到CBD △，点E ，F 分别在边,AB AD 上，连接,CF DE ．若AED AFC ∠=∠，且CF DE =35，则 ADAB 的值为 ．28．【学习心得】小雯同学在学习完“圆”这一章内容后，感觉到一些几何问题如果添加轴助圆，运用圆的知识解决，可以使问题变得非常容易．例如：如图1，在ABC V 中，AB AC =，90BAC ∠=︒，D 是ABC V 外一点，且AD AC =，求B D C ∠的度数．若以点A 为圆心，AB 长为半径作辅助圆A e ，则C 、D 两点必在A e 上，BAC ∠是A e 的圆心角，BDC ∠是A e 的圆周角．则45BDC ∠=︒．(1)如图2，在四边形ABCD 中，90BAD BCD ∠=∠=︒，25BDC ∠=︒，则BAC ∠=︒； (2)如图3，已知线段AB 和直线l ，用直尺和圆规在l 上作出所有的点P ，使得30APB ∠=︒（不写作法保留作图痕迹）；(3)①如图4①，已知矩形ABCD ，4AB =，BC m =，M 为边CD 上的点，若满足45AMB ∠=︒的点M 恰好有两个，则m 的取值范围为；②如图4②，在ABC V 中，45BAC ∠=︒，AD 是BC 边上的高，且3BD =，1CD =，求AD 的长．。
《大学英语（一）》第二次作业答案
《⼤学英语（⼀）》第⼆次作业答案《⼤学英语（⼀）》第⼆次作业答案⼀、单项选择题。
本⼤题共40个⼩题，每⼩题 2.5 分，共100.0分。
在每⼩题给出的选项中，只有⼀项是符合题⽬要求的。
1.— _______— I failed my driving test again.A.What shall I do?B.I’m down in spiritsC.What are you doing?D.What’s up?2.— Which is your preference, tea or coffee?— _______A.OK, thanks.B.I like bothC.Can I choose?D.I choose tea any time.3.— You’d better have more physical exercise.— _______A.I’d like that, but I can’t afford the time.B.That’s good.C.Really.D.Yes, I would.4.— I'm sure Class One will win the game.—________. Let's wait and see.A.Yes, I think soB.It's hard to sayC.ImpossibleD.That’s unlikely5.— Let’s go and have sports together.— _______A.Yes, please.B.You’re welcome.C.Good idea.D.Thank you.6.I think we should _______ these interesting old customs.C.reserveD.serve7.Because there is so much unemployment, the _______ for jobs is fierce.A.chanceB.contestC.pressure/doc/b415284600.htmlpetition8.Some words are hard to _______ because they have many different uses.A.spellB.pronounceC.defineD.mean9.The English of today is very different _______ the English of500 years ago.A.toB.inC.byD.from10.There are trees on _______ sides of the river.A.bothB.allC.eitherD.neither11.They want to _______ their own import-export business.A.set offB.set backC.set aboutD.set up12.My letters were all returned to me, so I decided to go around to her house _______ person.A.withB.atC.inD.of13.We _______ goods to over 40 different countries.14.William realized that he should have felt _______ with his job, but he didn’tA.contentedB.suitable/doc/b415284600.htmlfortableD.interested15.The young people spoke _______ length about their experiences.A.inB.atC.withD.by16.There are two _______ students on the play ground.A.hundredB.hundred ofC.hundredsD.hundreds of17.There is _______ ink in the bottle. I have to buy some.A.littleB.a littleC.fewD.a few18.Between 1820 and 1920 some 35 million _______ reached the United States.A.immigratesB.emigratesC.immigrantsD.emigrants19.Many small businesses are struggling _______ survival in this difficult economic climate.A.offB.withC.forD.up20.Advertising is often the most _______ method of promotion.21._______ a cold morning in June, I saw a stranger walking around the house.A.InB.AtC.OnD.For22.John was so drunk that he fell off the bike and _______ by the roadside until the next morning. /doc/b415284600.htmlidB.liedC.had lain/doc/b415284600.htmly23.His behavior _______ his lazy attitude toward to work.A.forbidsB.impressesC.reflectsD.occupies24.The hero of the story is an artist in his _______.A.thirtiethB.thirtyC.thirty’sD.thirties25.The pencil is _______ that one.A.as two time as longB.as long two times asC.two times as long asD.long as two times than26.It was _______ that came here at midnight.A.himB.themC.herD.theyD.covered28.I _______ on those days as the happiest time of my life.A.look atB.look downC.look backD.look for29.You must keep it secret. It is only _______ you and me.A.forB.toC.amongD.between30.The air in Beijing is getting much _______ now than a few years ago.A.cleanB.cleanerC.cleanestD.the cleanest31.The BBC _______ the news to all parts of the world.A.showsB.broadcastsC.tells/doc/b415284600.htmlmunicates32.I _______ to catch the early train, but I didn’t get up in time.A.managedB.intendedC.tendedD.failed33.A diet high in fat may be responsible _______ several types of cancer.A.forB.ofC.toD.atB.the otherC.otherD.another35.It wasn’t a good thing; _______ the contrary it was a huge mistake.A.ofB.onC.inD.at36.All in all we unexpectedly lost the match after two month of hard training.A.在经过两个⽉的艰苦训练后，我们所有的⼈都为输掉了这场⽐赛⽽意外。
上海电大闵一分校政治学原理计分作业(第一次、第二次)
上海电大闵一分校政治学原理计分作业第一次计分作业：4、“人类在本性上，也正是一个政治动物。
”这是（）的著名论断。
(单选题)A.梭伦B.亚里士多德C.卢梭D.柏拉图第1题你选择了 A. 正确答案 B. 结果×2. 1、政治是一种社会的利益关系，是对社会价值的权威性分配。
这种观点的代表人物为（）(单选题)A.戴维?伊斯顿B.亚里士多德C.卢梭D.马克斯?韦伯第2题你选择了 . 正确答案 A. 结果×3. 3、中国古代的政治研究的主导流派是（） (单选题)A.道家B.法家C.儒家D.墨家第3题你选择了 . 正确答案 C. 结果×4. 10、（）是第一个使政治学从伦理学中独立出来的现代政治学的奠基人，他的《君主论》也是探讨“治国术”的经典名著。
(单选题)A.洛克B.马基雅维里C.霍布斯D.博丹第4题你选择了 . 正确答案 B. 结果×5. 7、自宋代后，儒家发展产生了（）思想，为封建专制统治所利用。
(单选题)A.玄学B.禅学C.理学D.风水学第5题你选择了 . 正确答案 C. 结果×6. 8、西方国家政治生活中所遵循的许多基本原则都产生或成熟于（）时期。
(单选题)A.古希腊B.古罗马C.中世纪D.文艺复兴和宗教改革第6题你选择了 . 正确答案 D. 结果×7. 5、在理论内容上，古希腊、古罗马时代的政治研究从属于（） (单选题)A.伦理学B.神学C.历史学D.哲学第7题你选择了 . 正确答案 A. 结果×8. 9、第一次世界大战前后，美国主张政治学研究应采用社会学、心理学和统计学的方法，主张政治研究应价值中立，并以此为基础形成“（）”。
(单选题)A.政治科学B.行为主义C.政治社会学D.后行为主义第8题你选择了 . 正确答案 A. 结果×9. 2、“政就是众人之事，治就是管理，管理众人之事，便是政治。
”说这句话的是（） (单选题)A.孔子B.孙中山C.毛泽东D.斯大林第9题你选择了 . 正确答案 B. 结果×10. 6、现代政治学学科最早出现于（） (单选题)A.英国B.法国C.德国D.美国第10题你选择了 . 正确答案 D. 结果×11. 6、在古代西方语境中，政治的涵义应包含（） (多选题)A.政治是与城邦联系在一起的B.政治是城邦公民特定生活状态的总和C.城邦生活状态的特征是自由、平等D.政治是与专制不相容的E.没有了政治生活的公民就不成其为“人”第11题你选择了 . 正确答案 A,B,C,D,E. 结果×12. 1、下列关于“政治”的表述中属于权力性解释的是（） (多选题)A.政治是国家的活动，是治理国家，是夺取或保存权力的行为B.政治是权力斗争，是人际关系中的权力现象C.政治是人们在安排公共事务中表达个人意志和利益的一种活动，政治的目标是制定政策，也就是处理公共事务D.政治是制定和执行政策的过程E.政治是一种社会的利益关系，是对社会价值的权威性分配第12题你选择了 . 正确答案 A,B. 结果×13. 5、在古代中国语境中，言“政治”则必然包含下面的涵义（） (多选题)A.政治是对社会进行管理的方式B.政治含有国家处在或趋于良好状态的内在规定性C.要达到政治所内涵的良好状态，必须首先依据一定的规矩或标准D.政治也就是国家依据一定的规矩处于或趋于稳定状态E.政治必然是与国家有关的第13题你选择了 . 正确答案 B,C,D,E. 结果×14. 9、马克思的（）的理论发现，促成了马克思主义政治学的成熟。
2024年春江苏开放大学建筑信息建模(BIM)技术应用第二次作业答案
2024年春江苏开放大学建筑信息建模(BIM)技术应用第二次作业答案原创作者李想一、2024年春江苏开放大学建筑信息建模(BIM)技术应用第二次作业单选题答案1、基于BlM技术的O是指建立统一的设计标准，包括图层、颜色、线型、打印样式等，在此基础上，所有设计专业及人员在一个统一的平台上进行设计，从而减少现行各专业之间(以及专业内部)由于沟通不畅或沟通不及时导致的错、漏、碰、缺。
A、参数化设计B、协同设计C、可视化设计D、三维设计学生答案：B2、BlM模型内某一构件的空间位置用。
来表示A、高程B、地理坐标C、坐标和高程D、坐标学生答案：C3、ReVit中创建第一个标高IF之后，免制IF标高到上方5000处，生成新标高名称为OA、以上都不对B、IGC、2GD、2F学生答案：B4、建筑工程信息模型的信息应包含几何信息和OA、属性信息B、非几何信息C、时间信息D、空间信息学生答案：B5、BIM技术和O的结合完美地解决了可视化资产监控、查询、定位管理A、3D扫描技术B、GlS技术C、VR技术D、物联网技术学生答案：D6、下列关于BiM技术与CAD技术在建筑信息表达的描述中，不正确的是OA、CAD技术只能将纸质图纸电子化B、BIM可提供工程量清单、施工管理等更加丰富的信息C、CAD包含了建筑的全部信息D、BIM可提供二维和三维图纸学生答案：C7、下列软件产品中，属于BlM建模软件的是OA、PKPMB、RobotC、EcotechD、GMT学生答案：D8、下列关于BiM建模过程说法正确的是OA、首先建立网格及楼层线，然后导入CAD文档，接着建立柱梁板墙等组件，而后进行明细表或CAD输出，最后进行彩现B、首先建立网格及楼层线，然后导人CAD文档，接着建立柱梁板墙等组件，而后进行彩现，最后进行明细表或CAD输出C、首先建立网格及楼层线，然后进行彩现，接着导人CAD文档，而后建立柱梁板墙等组件，最后进行明细表或CAD输出D、首先进行彩现，然后导入CAD文档，接着建立柱梁板墙等组件，而后建立网格及楼层线，最后进行明细表或CAD输出学生答案：B9、O实现建设项目施工阶段工程进度、人力、材料、设备、成本和场地布置的动态集成管理及施工过程的可视化模拟。
水力学1第二次作业 (3)
= 29.30l / s Q2 = K 2
hf 2 l2
= 20.7l / s
根பைடு நூலகம்连续性方程
QC = QD + qlCD = 50l / s
QAB = QC + qB = 95l / s
h fCD lCD = 2 (QD + 0.55qlCD ) 2 = 3.43m K
对AB段,d AB = 250mm, 查表得K AB = 618.5L / S
Q2 Z= = 0.82m 2 ( c A) × 2 g
4-5 用水泵提水灌溉,水池水面高程▽179.5m, 用水泵提水灌溉,水池水面高程▽ , 河面水位▽ 河面水位▽155.0m;吸水管为长 ,直径 ;吸水管为长4m, 200mm的钢管,设有带底阀的莲蓬头及 °弯头 的钢管, 的钢管 设有带底阀的莲蓬头及45° 一个.压力水管为长50m,直径 的钢管, 一个.压力水管为长 ,直径150mm的钢管, 的钢管 设有逆止阀( ),闸阀 ),45° 设有逆止阀(ζ=1.7),闸阀(ζ=0.1), °的 ),闸阀( ), 弯头各一个,机组效率为80%;已知流量为 弯头各一个,机组效率为 ; 50000cm3/s,问要求水泵有多大扬程? ,问要求水泵有多大扬程?
k1 = 1.06
k2 =1.05
水泵出水口A点的压强水头为 水泵出水口 点的压强水头为
p A pD HA = = + k1h f1 + k 2 h f 2 + h f 3 ρg ρg
= 4 + 1.06 × 2.69 + 1.05 × 4.06 + 10.4 = 21.5m水柱高
4—8 水塔供水的管道上有并联管道 及2,如图所示.管 水塔供水的管道上有并联管道1及 ,如图所示. 道为铸铁管,水自D点出流时 要求服务水头Hz为 , 点出流时, 道为铸铁管,水自 点出流时,要求服务水头 为8m, 其流量Q 点出流量q 其流量 D为20 l /s;在B点出流量 B为45 l /s;CD段为沿 ; 点出流量 ; 段为沿 程均匀泄流管道,单位长度上的沿程泄流量q为 程均匀泄流管道,单位长度上的沿程泄流量 为 100cm3/s-m,管长 CD为300m,管径 CD为200mm;管 ,管长l ,管径d ; 长l1为350m,管径 1为150mm;管长 2为700m,管径 2 ,管径d ;管长l ,管径d 为150mm;总管长 AB为500m,管径 AB为250mm;D点 ;总管长l ,管径d ; 点 高程▽ 高程▽为100.0m.试决定并联管道内流量分配,并计算 . 决定并联管道内流量分配, 水塔的水面高程. 水塔的水面高程.
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国际贸易第一次作业（1～3章）
姓名学号专业、班级
一、单项选择题
1.国际贸易的产生必须具备如下条件______。
A.剩余产品的出现和国家的形成
B.商人的出现和国家的形成
C.国际分工的产生和剩余产品的出现
D.商品生产的扩大与商人的出现
2.反映对外贸易的实际规模，便于各个时期进行比较的指标是______。
A.对外贸易额
B.对外贸易量
C.对外贸易值
D.对外贸易依存度
3.从根本上说，对外贸易产生和发展的基础是______。
A.资本主义生产方式的确立
B.世界市场的形成
C.国际分工的出现
D.社会生产力的发展和生产关系的变化
4.对外贸易是“经济增长的引擎”的观点是由______提出来的。
A.大卫·李嘉图
B.亚当·斯密
罗伯逊
D.马克思
5.亚当·斯密和李嘉图认为国际贸易产生的根源是______。
A.各国间商品价格不同
B.各国生产各种商品的劳动生产率不同
C.各国生产要素禀赋不同
D.各国间要素价格不同
6.劳动力充裕的国家应专门生产劳动密集型产品进行对外交换，这种说法来自______。
A.亚当·斯密绝对成本说
B.李嘉图比较成本说
C.赫克歇尔－俄林要素禀赋说
D.凯恩斯贸易差额说
7.中国生产一只手表需要8个劳动日，生产一辆自行车需9个劳动日，泰国生产手表和自行车分别需要13个和11个劳动日，根据比较成本说______。
A.中国应生产和出口手表
B.中国应生产和出口自行车
C.泰国应生产和出口手表
D.贸易无法进行
8.战后的国际分工出现了______的新形式。
A.宗主国与殖民地
B.工业国与农业国
C.产业内贸易分工
D.产业间贸易分工
二、填空题
1.对外贸易依存度是指在一定时期内该国__________ 与_________ _ 之比。
2.一般来说，在进出口统计中，各国都是按__________价格计算出口额，按__________价格计算进口额，因此，世界出口总额__________世界进口总额。
3.在国际贸易统计分类中，以货物通过__________作为统计进出口的标准，称为总贸易体系；以货物经过__________作为标准，称为专门贸易体系。
国际贸易第二次作业（1～3章）
姓名学号专业、班级
一、名词解释
1.国际贸易：
2.转口贸易：
3.对外贸易依存度：
4. 比较优势：
5. 要素密集度：
6．赫克歇尔－俄林定理：
7.罗布津斯基定理：
8. 斯托尔帕－萨缪尔森定理：
二、简答题
1.简要比较绝对优势和比较优势。
2.“世界上一些最贫穷的国家找不到什么产品出口。
在这些国家里，没有一种资源是充裕的。
不用谈资本，也不用说土地，在一些又小又穷的国家，甚至连劳动也不充裕”。
请运用国际贸易理论对这段话进行评析。
三、计算分析题
1.假设世界上有四个国家，中国、美国、法国、泰国，4国都生产大米和小
单位产品劳动投入
大米小麦
美国法国中国泰国2
5
9
8
2
6
8
（1）计算各国大米的相对成本，并判断出哪个国家在大米的生产上最具有比较优势，哪个国家在小麦生产上最具有比较优势？
（2）如果国际市场上大米的相对价格是3，那么，中国是否具有出口大米的比较优势？
2.有A、B两个国家，生产X、Y两种产品，单位产品的生产成本（劳动力—小时）如下表所示。
国家X产品成本Y产品成本
A 20 50
B 40 20
势产品，按1：1的比例交换，其他条件符合绝对成本理论的假设条件。
请分析和计算：
（1）各国的绝对优势产品是什么？分工后各自生产哪种产品？
（2）计算两国分工前后的生产和贸易情况，并将计算结果填入表中。
解：（1）
（2）根据第二问可得：
国家
分工前产量分工后产量
X Y 总量X Y 总量
A B 1
1
1
1
2
2
设A国对X的消费量为，B国对Y的消费量为1，多余产品以1：1的比例与对方交换，请计算两国贸易利益并填写下表
国家产品X 产品Y 比分工前多消费
A
B。