大专考试题及答案(考大专的试题及答案)

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电大专科基础会计试题及答案(2017最新整理)

这是我找到的一些题，看看是不是你想要的。这些题是我在电大题酷小程序搜集的，你可以去看看，能不能找到你想要的试题和答案。

1、下列会计职能中，不属于会计的扩展职能的是( B )。

a. 会计预测

b. 会计反映

c. 会计分析

d. 会计决策

2、会计对经济活动进行综合反映，主要是利用( A )。

a. 货币量度

b. 实物度量

c. 工时度量

d. 劳动度量

3、会计以（C）作为计量单位。

a. 工时

b. 实物

c. 货币

d. 劳务

4、根据各种会计核算方法之间的相互关系，编制报表前要进行（D）。

a. 会计记录

b. 复式记账

c. 成本计算

d. 财产清查

5、下列选项中，不属于会计职能的是（B）。

a. 控制

b. 计量

c. 分析

d. 反映

6、会计核算是指会计工作收集、加工，储存和揭示会计信息的过程，这个过程由以下几个环节构成（ABDE）。

a. 确认

b. 计量

c. 披露

d. 报告

e. 记录

7、会计核算方法包括（ABCDE）。

a. 财产清查

b. 填制和审核凭证

c. 编制财务报表

d. 登记账簿

e. 成本计算

8、下列会计职能中，属于会计的扩展职能的是( ABDE )。

a. 会计决策

b. 会计预测

c. 会计反映

d. 会计考评

e. 会计分析

9、会计的反映职能具有（ABCDE）的特点。

a. 连续性

b. 可验证性

c. 客观性

d. 综合性

e. 可比性

10、会计计量的属性有（ABCDE）。

a. 可变现净值

b. 公允价值

c. 现值

d. 重置成本

e. 历史成本

11、会计反映是会计的扩展职能。 ( 错 )

对

错

12、会计决策是会计的扩展职能之一。( 对 )

对

错

13、会计核算包括确认、计量、检查和报告四个环节。（错）

对

错

14、会计方法除了会计核算方法，还包括其他会计管理方法。( 对 )

对

错

15、会计既是一个信息系统，也是一项管理活动。（对）

对

错

16、账户的名称就是（B）。

a. 会计记录

b. 会计科目

c. 会计确认

d. 复式记账

17、财产所有权与管理权相分离情况下，会计的根本目标是（D）。

a. 提高经济效益

b. 提供会计信息

c. 控制和指导经济活动

d.完成受托责任

18、登记账簿是在账簿上连续、完整、（A）地记录经济业务的一种专门方法。

a. 系统

b. 全面

c. 合理

d. 准确

2020年成人大专考试题目有哪些?

2020年成人大专考试题目有：

1.单项选择题

很多选择题考查的知识点都来自书中，所以同学们在复习的时候一定要抓重点，背知识。在答题时，如果能瞬时准确地把答案找出最好。假如没把握，就要采用排除法，即要从排除最明显的错误开始，把接近正确答案的备选项留下，再分析比较，逐一否定，最终选定正确答案。

2.多项选择题

多项选择题得分标准是：多选少选或错选是不给分的，所以大家在面对多选题时都非常谨慎。其实许多多项选择题往往出自于某一基本问题，命题者把该问题的几个要点作为正确选项。

干扰项当中，有的干扰项一看就知道是错误的，则立即排除，而有些干扰项是无法一下判定对错的，甚至其本身就没错，只是被放错了位置，同单项选择题一样，看命题和教材顺序选择，依然有效。另外还有一点大家也不要忽略了，就是在选中答案之后，一定要按照字母A、B等备选项顺序来进行书写。

3.名词解释题

名词解释题答案一定要简练、概括、准确，只要理解了。当然，名词解释这种题型用自己的话去解释也可以，不必非要拘泥于原文。如果实在是答不上，那么建议大家可以顾名思义，根据题目去猜想，然后再进行解释。

4.简答题

简答题一般围绕基本概念、原理及联系进行命题。考生答题时既不能像名词解释那么简练，也不要像论述题一样长篇大论。答案要有层次，列出要点，并简要扩展。

5.论述题

论述题这种题型，建议大家可以先列出答案要点，然后对要点逐一展开叙述，把自己的能力全部发挥出来，要在深度上和广度上努力，内容多多益善。如果时间紧张，那就直接把几个要点作答在试卷上。注意，一定要记得分段并且留一定空白以备叙述，然后发挥形象思维能力。

聚酰胺吸附能力最强的化合物是间苯酚吗

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天然药物化学大专题库(含答案)分解

一、填空题

1. 按皂苷元的化学结构不同，皂苷可分为两大类，即三萜皂苷和甾体皂苷。

2. 按极性大小的顺序，可将溶剂分为水、亲水性有机溶

剂、亲脂性有机溶剂。

3. 常用的亲水性的有机溶剂有：甲醇、乙醇、

丙酮。

4. 苷类是指糖或糖的衍生物端基碳原子上的羟基与非糖物质脱水缩合而形成的一类化合物，其中非糖物质为苷元，连接两者的化学键为苷键。

5. 苷类的结构按照苷键原子的不同可以分为氧苷、硫苷、氮苷、碳苷四类。

6. 香豆素是一类具有苯骈 -吡喃酮母核的天然产物的总称，从结构上看，是由顺式邻羟基桂皮酸分子内脱水而成的内酯。木脂素是一类由

2~4分子苯丙素衍生物聚合而成的天然化合物，其广泛存在于植物的木质部和树脂中。

7. 香豆素类化合物根据其母核上取代基和骈环的状况不同可非为五大类，即简单香豆素、呋喃香豆素、吡喃香豆素、异香豆素及双香豆素等类型。

8. 薄层色谱法的具体操作：制板、活化、点样、展开、显色、测量及计算R f值等五个步骤。

9. 溶剂提取法中良好溶剂的选择应遵循“相似相溶”的规律，根据

溶剂的极性，被提取成分及共存的其他成分的性质来决定，同时兼顾考虑溶剂是否使用安全、易得、价廉等问题。

10. 提取受热易破坏的成分，能保持良好的浓度差的一种动态浸提方法是渗滤法；使用索氏提取器进行提取的方法是连续回流提取法；提取有升华性成分的常用方法是升华法；提取能随水蒸气蒸馏且不溶于水的成分的提取方法水蒸气蒸馏法。

11. 挥发油是一类具有芳香气味油状液体的总称，在常温下能挥发，与水不相互溶。萜类化合物是一类概括所有异戊二烯聚合物及其含氧衍生物的总称。

12. 皂苷是一类结构比较复杂的苷类化合物，它的水溶液经振摇后能产生大量持久性、似肥皂样的泡沫，按照其苷元的化学结构不同，可分为两大类，即三萜皂苷和甾体皂苷。

13. 强心苷是自然界中存在的一类对心脏有显著生物活性的甾体苷类化

合物。生物碱是自然界中一类含氮有机化合物，大多数具有氮杂环的结构，呈碱性并具有较强的生物活性。

14. 生物碱的碱性强弱和氮原子的杂化方式、诱导效应、共轭效应、

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2009年6月21日大专英语B级考试题以及答案

就算别人给了你还没有考的答案，也不得轻易相信哦

相信自己比相信别人更重要。

与其将自己的“命运”压在别人的身上，还不如拼死一搏呢

说不定还会成功呢！

08年12月的试题和答案是有的，具体如下：

（因为最多能回答一万字，所以很面省略了一些不是特别重要的内容，不会影响你的备考。）

试题：

第1部分：词汇选项(第1～1 5题，每题1分，共15分)

下面每个句子中均有1个词或短语划有底横线，请为每处划线部分确定1个意义最为接近的选项。

1 She found me very dull

A dirty B sleepy C lazy D boring

2 The President made a brief visit to Beijing

A short B working C forma D secret

3 He was persuaded to give the idea.

A mention B accept C consider D drop

4 Jack consumes a pound of cheese day.

A eats B drinks C buys D produces

5 Mary just told us a very fascinating story.

A strange B frightening C difficult D interesting

6 It's a gorgeous day anyway

A lovely B cold C normal D rainy

7 Her life is becoming more diverse

A generous B humorous C varied D romantic

8 Foreign military aid was prolonging the war

A broadening B worsening C extending D accelerating

9 She was unwilling to go but she had no choice.

A unable B indecisive C ready D reluctant

10 She is.slender，with delicate wrists and ankles

A sick B weak C slim D pale

11 With immense relief, stopped running

A some B enormous C little D extensive

12 The scientists began to accumulate data

A collect B handle C analyze D investigate

13Jack eventually Overtook the last truck

A hit B passed C reached D led

14 Sometimes it is advisable to book hotels in advance

A possible B profitable C easy D wise

15 The reason for their unusual behavior remains a puzzle.

A fact B mystery C statement D game

因为我最多回答一万字。为了节约篇幅，省略第二部分，因为这个部分还是很容易的。

第3部分：概括大意与完成句子(第23—30题，每题1分，共8分)

下面的短文后有2项测试任务：(1)第23~26题要求从所给的6个选项中为第2～5’段每段选择1个最佳标题;(2)第27～30题要求从所给的6个选项中为每个句子确定1。个最佳选项。

The Supercomputer Network

1 Recently, ten laboratories run by governments in different parts of the world have become linked.Their computers have been connected so they can“talk”to each other. This may not seem very dramatic news，but it is the beginning of a development that will increase the power of the Internet tremendously.

2 The lnternet is an interconnected (互联)system of networks that connects computers round the world and facilitates the transmission and exchange of information. The way that you use the Intermit is by accessing this network.This depends on the power that your system allows you to use.The power of your computer is responsible for how fast you can download(下载)files，how much data you can store，etc.If your computer is old and slow，accessing the information can be very difficult.

3 The new development in information technology has been called“the grid”(网格技术)，and it will be a network of computers that are linked together.The“grid”will work in a different way from the I internet. enabling you to get the power of the biggest computers in the world on your computer.Accessing the information will no longer depend on the power of your computer.The idea is that while you access information，you will also have ‘access to the power of the bigger computer stations.

4 One advantage of this revolutionary idea is that geographical location will become irrelevant.The“grid”will decide which are the best parts of a worldwide network to do the job you want.This means that you may be accessing a computer In Japan to solve a problem in Alaska.

5 The“grid”can be compared to having an efficient personal assistant.You can gave your assistant a task and“he”w{Il d0 it for you.The assistant will do the preliminary research，collect the data，compare them and decide on the best course of action by accessing any of the computer centers in the “grid” that happen to have the relevant information.Ail you have to do is assign the task，sit back and wait.

6 At present.possible applications of the“grid”in scientific research are being explored.While it has taken about fifteen years for Internet use to become widespread， experts believe that the “grid” could be us and running for private individuals far more quickly.Scientists working“grid’’projects are convinced that it will be as widely used as the web in the next ten years.

23 Paragraph 2____________

24 Paragraph 3____________

25 Paragraph 4____________

26 Paragraph 5____________

A How does the “grid” work?

B Power shared

C Just make a request

D Limitations of present Internet use

E Distance is not a problem

F A new era for the Internet

27 Traditionally the power of your computer determines how fast you can access____________

28 The “grid” will enable you to get on your computer the power of___________

29 The “grid” would be like____________ who can perform your tasks efficiently

30 It is believed that the widespread use of the “grid” will become possible in the next__________

A the bigger computer stations

B the advantage

C ten years

D information

E your personal assistant

F fifteen years

第4部分：阅读理解(第31—45题，每题3分，共45分)

第一篇Sunspots

It's not surprising that sunspotswere observed by ancient astronomers。The largest soupspoon the sun can be seen without a telescope.It was not until the invention of the telescope(望远镜)in the early 17th.century，however，that systematic studies of sunspots could be undertaken.The great astronomer Galileo was among the first to make telescopic observations of sunspots

Sunspots are regions of extremely strong magnetic fields(磁场)found on the sun’S surface.A sunspot has a dark central core known as the umbra.The umbra is surrounded by a dark ring called the penumbra，where the magnetic field spreads outward.Sunspots appear dark because they are giving off less radiation.They are cooler than the rest of the sun’ S surface Sunspots are frequently observed’in-'pairs of in paired groups.The members of a.spot pair are identified as the leading spot and the following spot.They are identified by their position in the pair in terms of the direction in Which the sun rotates(旋转) The number of sunspots at any one time varies.A large spot group may consist of as many as 10 groups and 300 spots across the sun.The number of spots changes in a fairly regular pattern called the sunspot cycle.The largest number occurs about every 11 years.At sunspot minim L{m，there are at most just a few small spots The average lifetime of an individual spot group is roughly one solar rotation，which is about 25 days.The most persistent large slops，however can survive for two to three months.

题目省略。

第二篇 Where Have All the Bees Gone?

Scientists who study insects have a real mystery on their hands.All across the country, honeybees are leaving their hives(蜂巢)and never returning.Researchers call this phenomenon colony-collapse(群体瘫痪)disorder.It is reposed that 25 to 40 percent of the honeybees in the US have vanished from their hives since last fall.So far, no one can explain why.

Colony collapse is a serious concern because bees play an important role in the production of about one—third of the foods we eat.As they feed，honeybees spread pollen (花粉)from flower to flower.Without this process，a plant can’t produce seeds or fruits.

Now，a group of scientists and beekeepers have teamed up to try to figure out what’S causing the alarming collapse of SO many colonies.They hope to find out what’S contributing to the decline and to prevent bee disappearance in the future.

It could be that disease is causing the disappearance of the bees.To explore that possibility, Jay Evans，a researcher at the United States Department of Agriculture (SDA)Bee Research Laboratory, examines bees taken from colonies that are collapsing.“We know what a healthy bee should Look Like on the inside.and we can look for physical signs of disease.”he says.And bees from collapsing colonies don’t look very healthy.“Their stomachs are worn down.compared to the stomachs of healthy bees，’’ ‘Evans says.It may be that a parasite(寄生虫)making the bees’digestive organs. Their immune(免疫的)systems may not be working as they should.Moreover，they have high levels of bacteria inside their bodies.

Another cause of colony—collapse disorder may be certain chemicals that farmers apply to kill unwanted insects on crops，says Jerry Hayes，chief bee inspector for the Florida Department of Agriculture.Some studies，he says，suggest that a certain type of insecticide(杀虫剂)affects the honeybee’S newels system and memory.“It seems like honeybees are going out and getting confused about where to go and what to do”he says.

1f it turns out that a disease is contributing to colony collapse，bees’genes could explain why some colonies have collapsed and others have not.In any group of bees there are many different kinds of genes.The more different genes a group has，the higher the group’S genetic diversity.So far scientists haven’t determined the role of genetic diversity in colony collapse，but it's a promising theory，says Evans.

题目省略。

第三篇A Tale of Scottish Rural Life

Lewis Grasses Gibbon’s Sunset Song(1932)was voted“the best Scottish novel of all time”by Scotland’s reading public in 2005.Once considered shocking for its frank description of aspects of the lives of Scotland’s poor rural farmers，it has been adapted for stage，film。TV and radio in recent decades.

The novel is set on the fictional estate of Kin Addie，in the farming country of the Scottish northwest in the years up to and beyond World War I.At its heart is the story of Chris，who is both part of the community and a little outside it.

Grasses Gibbon gives us the most detailed and intimate account of the life of his heroine(女主人公).We watch her grow through a childhood dominated by her cruel but hard—working father;experience tragedy(her mother’s suicide and murder of her twin children);and learn about her feelings as she grows into a woman.We see her marry， Lose her husband，then marry again.Chris has seemed so convincing a figure to some female readers that they cannot, believe that she is the creation of a man.

But it would be misleading to suggest that this book is just about Chris.It is truly a novel of a place and its people.Its opening section tells of Kin Addie’s long history, in a language that imitates the place’s changing patterns of speech and writing.

The story itself is amazingly full of characters and incidents.It is told from Chris’point of view but also from that of the gossiping community，a community where everybody knows everybody else’s business and nothing is ever forgotten.

Sunset Song has a social theme too.It is concerned with what Grasses Gibbon perceives as the destruction of traditional Scottish rural life first by modernization and then by World War I.Gibbon tried hard to show how certain characters resist the war. Despite this，the war takes the young men away, a number of them to their deaths.In particular, it takes away Chris’husband，Evan Avondale.The war finally kills Evan，but not in the way his widow is told，In fact.the Germans amen’t responsible for his death，but his own side.He is shot because he is said to have run away from a battle.

If the novel is about the end of one way of life it also looks ahead.It is a“Sunset Song”but is concerned too with the new Kin Addie，indeed of the new European world. Grasses Gibbon went on to publish two other novels about the place that continue its story.

第5部分：补全短文(第46～50题，每题2分，共10分)

下面的短文有5处空白，短文后有6个句子，其中5个取自短文，请根据短文内容将其分别放回原有位置，以恢复文章原貌。

Rising Tuition in the US

Every Spring，US university administrators gather to discuss the next academic year’s budget.They consider faculty salaries，utility costs for dormitories，new building needs and repairs to old ones.They run the numbers and conclude—it seems，inevitably —that，yet again，the cost of tuition must go up.

According to the US’s College Board，the price of attending a four-year private university in the US rose 81 percent between 2005 and 2006，the numbers continued to rise. 1993 and 2004.________(46)In According to university officials.college cost increases are simply the result of balancing university checkbooks.“Tuition increases at Cedarville University are determined by our revenue needs for each year,”said the university’s president，Dr Bill Brown.“Student tuition pays for 78 percent of the university’s operating costs。”Brown’s school is a private university that enrolls about 3，1 00 undergrads and is consistently.recognized by annual college ranking guides like US News and World Report’s and The Princeton Review’s.__________(47)

Tuition at private universities is set by administration officials and then sent for approval to the school’s board of trustees (监管)all of a state’s public institutions.John Durham，assistant secretary (董事) ________ (48) This board oversees to the board of trustees at East Carolina University(ECU)，explains that state law says that public institutions must make their services available whenever possible to the people of the state for free.Durham said that North Carolina residents only pay 22 percent of the cost of their education? _____(49)State residents attending ECU pay about us$10，000 for tuition room and board before financial aid.

Amid the news about continued increases in college costs，however，there is some good news.Tuition increases have been accompanied by roughly equal increases in financial aid at almost every university.To receive financial aid，US students complete a formal application with the federal government. The federal government then decides whittler an applicant is eligible(有资格的)for grants or loans________(50)

A. The application is then sent to the student's university, where the school itself will decide whether free money will be given to the student and how much

B. At public universities, however, tuition increases must also be approved by a state education committee, sometimes called the board of governors

C. The school currently charges US$23,410 a year for tuition.

D. Many American people are simply unable to pay the growing cost of food

E. That's more than double the rate of inflation.

F. The state government covers the rest

第6部分：完型填空(第51～65题，每题1分，共15分)

下面的短文有15处空白，请根据短文内容为每处空白确定1个最佳选项。

Paper or Plastic?

Take a walk along the Chesapeake Bay, and you are likely to see plastic bags floating in the water.They have made their_______(51)into local waterways and，from there，into the bay, where they can________(52)wildlife.Piles of them show up in landfills(垃圾填埋地)and on city streets.Plastic bags also take an environmental toll(代价)in the__________(53)of millions of barrels of oil expended every year to produce them.

Enter Annapolis and you will see plastic bags_______(54)free in department stores and supermarkets.Alderman(市议员)Sam Shoeshine has introduced a well-meaning_______(55)to ban retailers from distributing plastic shopping bags up Maryland’S capital.Instead，retailers would be required to recycled paper and to sell reusable bags.The city of Baltimore.similar measure.Opponents of the are harmful，too：They cost more to’make;they_______(58)，however_______(56)bags made of________(57)a argue that paper bags_______(59)more resources to.transport，and recycling them causes more pollution than recycling plastic.The argument for depriving Annapolis residents Everyone in this _________(60)their plastic bags is far from accepted________(61)is right about one thing：Disposable shopping bags of any type are wasteful，and the best outcome would be for customers to ________(62)bags instead.Annapolis’mayor is investigating how to hand out free，reusable shopping bags to city residents，a proposal that can proceed ________(63)of whether other bags are banned.A less-expensive alternative would be to encourage retailers to give be more________(64)to customers who bring their own reusable bags.And this policy would_________(65)if stores imitated furniture mega—retailer(超人零售商)Ikea and charged for disposable bags at the checkout counter.A broad ban on the use of plastic shopping bags is not the answer.

51. A difference B point C progress D way

52. A harm B help C keep D protect

53. A light B form C time D place

54. A dropped B packed C put D distributed

55. A proposal B service C system D change

56. A open B fill C offer D hold

57. A getting B considering C replacing D improving

58. A idea B effect C technology D behavior

59. A limit B provide C destroy D consume

60. A from B with C of D in

61. A debate B organization C project D program

62. A reform B reuse C repair D reduce

63. A instead B because C regardless D careless

64. A examples B instructions C discounts D receipts

65.A impressive B effective C formal D typical

下面是答案：

第一部分词汇选项题

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

D A D A D A C C D C B A B D B

第二部分阅读判断

16 17 18 19 20 21 22

A A B B C C A

第三部分概括大意与完成句子

23 24 25 26 27 28 29 30

D F E A D A E C

第四部分阅读理解

第一篇 Sunspots

31 32 33 34 35

B A C D C

第二篇 Where have all the bees gone?

36 37 38 39 40

C A B B A

第三篇 A tale of Scottish rural life

41 42 43 44 45

D D B B C

第五部分补全短文

46 47 48 49 50

E C B F A

第六部分完型填空

51 52 53 54 55 56 57 58 59 60 61 62 63 64 65

D A B D A C B A D C A B C C B

大专考试题及答案(考大专的试题及答案)

有关大专机械设计基础的试题及答案、、、

一填空题（每小题2分，共20分）

1. 两构件通过.点或线接触组成的运动副称为高副。

2. 满足曲柄存在条件的铰链四杆机构，取与最短杆相邻的杆为机架时，为曲柄摇杆机构，取最短杆为机架时，为双曲柄机构。

3. 在凸轮机构中，常见的从动件运动规律为匀速运动时，将出现刚性冲击。

4. 直齿圆柱齿轮作接触强度计算时，取节线处的接触应力为计算依据，其载荷由一对对齿轮承担。

5. 为使两对直齿圆柱齿轮能正确啮合，它们的模数m 和压力角必须分别相等。

6. 两齿数不等的一对齿轮传动，其弯曲应力6.相等等；两轮硬度不等，其许用弯曲应力不相等等。

7. V带传动的主要失效形式是.打滑和疲劳断裂。

8. 在设计V带传动时，V带的型号是根据计算功率Pc 和小轮转速n1 选取的。

9. 链传动中的节距越大，链条中各零件尺寸越大，链传动的运动不均匀性增大。

10. 工作时只受弯矩不承受转矩的轴称为心轴。

二、选择题（每小题1分，共5分）二、选择题 C B D B D

1. 渐开线标准齿轮的根切现象发生在。

A. 模数较大时 B. 模数较小时

C. 齿数较少时 D. 齿数较多时

2. 在下列四种型号的滚动轴承中，必须成对使用。

A. 深沟球轴承 B. 圆锥滚子轴承

C. 推力球轴承 D. 圆柱滚子轴承

3. 在下列四种类型的联轴器中，能补偿两轴的相对位移以及可以缓和冲击、吸收振动的是。

A. 凸缘联轴器 B. 齿式联轴器

C. 万向联轴器 D. 弹性套柱销联轴器

4. 在铰链四杆机构中，机构的传动角和压力角的关系是。

A. B. C. D.

5. 对于普通螺栓联接，在拧紧螺母时，螺栓所受的载荷是。

A. 拉力 B. 扭矩 C. 压力 D. 拉力和扭矩

三、判断题（正确的打“V”，错误的打“X”。每小题1分，共8分）三、判断提 X X V X X X X V

1. 在铰链四杆机构中，当最短杆与最长杆长度之和大于其余两杆长度之和时，为双曲柄机构。（）

2. 在凸轮机构中，基圆半径取得较大时，其压力角也较大。（

3. 在平键联接中，平键的两侧面是工作面。（）

4. 斜齿圆柱齿轮的标准模数是大端模数。（）

5. 带传动在工作时产生弹性滑动是由于传动过载。（）

6. 转轴弯曲应力的应力循环特性为脉动循环变应力。（）

7. 向心推力轴承既能承受径向载荷，又能承受轴向载荷。（）

8. 圆盘摩擦离合器靠在主、从动摩擦盘的接触表面间产生的摩擦力矩来传递转矩。（

四、问答题（每小题3分，共9分）

1. 试述齿廓啮合基本定律。

2. 试述螺纹联接防松的方法。

3. 试分析影响带传动承载能力的因素？四、问答题

1.所谓齿廓啮合基本定律是指：作平面啮合的一对齿廓，它们的瞬时接触点的公法线，必于两齿轮的连心线交于相应的节点C，该节点将齿轮的连心线所分的两个线段的与齿轮的角速成反比。

2.螺纹连接的防松方法按工作原理可分为摩擦防松、机械防松及破坏螺纹副防松。

摩擦防松有：弹簧垫圈、双螺母、椭圆口自锁螺母、横向切口螺母

机械防松有：开口销与槽形螺母、止动垫圈、圆螺母止动垫圈、串连钢丝

破坏螺纹副防松有：冲点法、端焊法、黏结法。

3.初拉力Fo? 包角a? 摩擦系数f? 带的单位长度质量q? 速度v

五、分析判断题（共12分）

1. 在铰链四杆机构中，已知 mm， mm， mm， mm，试判断该机构的类型，并给出判断依据。（本题6分）题五、1图

2. 如图所示展开式二级斜齿圆柱齿轮传动，Ⅰ轴为输入轴，已知小齿轮1的转向和齿轮1、2的轮齿旋向如图所示。为使中间轴Ⅱ所受的轴向力可抵消一部分，试确定斜齿轮3的轮齿旋向，并在图中标出齿轮2、3所受的圆周力、和轴向力、的方向。（本题6分）题五、3图五、分析判断题

1.解：此四杆机构的四杆满足杆长和条件

Lab＋Lad《 Lbc＋Lcd

且由题已知机构以最短杆的邻边为机架，故此机构为曲柄摇杆机构

2.解：

1）3齿轮为右旋

2）受力方向如图

六、计算题（共36分）

1. 计算下列机构的自由度，并指出存在的复合铰链、虚约束或局部自由度（每小题3分，共6分）

题六、1图

2. 已知轮系如2图所示中，，， ? ，，，且顺时针转动。求杆系H的转数和回转方向。（本题10分）

3. 如图所示的压力容器，容器盖与缸体用6个普通螺栓联接，缸内压强，缸径，根据联接的紧密性要求，每个螺栓的残余预紧力F″=1.6F,F为单个螺栓的工作拉力。若选用螺栓材料的屈服极限 N/mm2，试按安全系数S=2时计算所需螺栓的小径。（本题10分）题六、2图题六、3图

4. 一对角接触球轴承反安装（宽边相对安装）。已知：径向力，，外部轴向力，方向如图所示，试求两轴承的轴向力、。（注：内部轴向力）。（本题10分）

题六、4图六、计算题

1. a）解：F＝3n－2PL－Ph

＝3*5－2*7－0

＝1

此题中存在复合铰链

备注：此题中5个构件组成复合铰链，共有4个低副

b）解：F＝3n－2PL－Ph

＝3*4－2*5－1

＝1

此题中滚子为局部自由度

解：由题意的得，5-3-6-4组成行星轮系

i54H＝n5-nH/n4－nH ＝－Z3*Z4/Z5*Z6

因为1－2－5组成定轴轮系

i12＝n1/n2＝n1/n5＝Z2/Z1

所以n5＝450r/min

把n4＝0及n5＝450r/min代入上式

得到

nH＝5.55r/min

这表明系杆H的旋转方向和齿轮1的一致

解：

单个螺栓的Q＝Q’＋F＝2.6F

Q*Z＝S*P*A

2.6F*6＝2*3.14*D2/4

得F＝2264.4N

[σ]=300/2=150N/mm

所以d1由公式得，d1＝15.81mm

取螺栓的直径为16mm

4.你换掉这道题目好了

七、结构题（本题10分）

下图为斜齿轮、轴、轴承组合结构图。齿轮用油润滑，轴承用脂润滑，编写序号列出图中的各设计错误，并指出设计错误的原因。（注：不必改正）

题七图第七题

1.无垫片，无法调整轴承的游系

2.轴肩过高，无法拆卸轴承

3.齿轮用油润滑，轴承用脂润滑，但无挡油盘

4.轴套长度应小于轮毂的长度

5.同一根轴上的两个键槽应布置在同一母线上。

6.套筒顶不住齿轮（过定位）

7.套筒应低于轴承外圈

8.轴承端盖与相应轴段处应有密封件，且与轴间不应接触，应有间隙。

9.连轴器无轴向固点，且与端盖间隙太小，易接触

10.键顶部与轮毂糟间应有间隙。

电大专科《学前教育学》试题整理及答案

随便在电大题酷这个小程序上搜了几道题，不知道你现在还需不需要呢？正确答案也可以在这个小程序上搜吧~这个小程序对电大人来说还是挺实用的，搜答案也很方便，希望能够帮到你~~~~~~~

1.1919 年陈鹤琴提出了“活教育理论”，指出学前教育十大原则，下列不属于其原则范围的是）。

选择一项：

a. 科学性

b. 启发性

c. 大众性

d. 民族性

正确答案是：科学性

2.五四运动之后，我国的学前教育原则强调“实用主义”和“自然适应性原则”，其主要学习的国家是（）。

选择一项：

a. 德国

b. 美国

c. 苏联

d. 法国

正确答案是：美国

3.卢梭对儿童教育的贡献首先是（）。

选择一项：

a. “活教育”

b. “教育即生长”

c. “儿童的发现”

d. “儿童中心论”

正确答案是：“活教育”

4.夸美纽斯的学前教育经典著作是（）。

选择一项：

a. 《爱弥儿》

b. 《世界图解》

c. 《人的教育》

d. 《母育学校》

正确答案是：《爱弥儿》

5.学前公共教育思想诞生的代表人物是（）。

选择一项：

a. 夸美纽斯

b. 亚里斯多德

c. 柏拉图

d. 孔子

正确答案是：亚里斯多德

标签: 大专考试题及答案

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