相关试题
【判断题】
材料变形时在弹性范围内，应力与应变成反比。
【判断题】
弹性变形是外力卸除后杆件的变形不能消除的变形。
【判断题】
塑性变形是外力卸除后杆件的变形不能消除的变形。
【判断题】
减小压杆的长度，能有效的提高压杆的稳定性。
【判断题】
扭转变形的变形特点是各截面绕杆轴发生相对转动。
【判断题】
当梁弯曲变形时，梁的轴线由直线变为折线。
【判断题】
简支梁上在均布荷载作用下，最大弯矩值发生在跨中。
【判断题】
悬臂梁在自由端有集中力作用，最大弯矩发生在自由端。
【判断题】
悬臂梁的最大剪力和最大弯矩均发生在支座上。
【判断题】
简支梁在跨中作用一集中力时，其弯矩图形是抛物线。
【判断题】
简支梁在均布荷载作用时，其弯矩图形是抛物线。
【判断题】
梁的正应力在横截面上是离中性轴越远正应力越小。
【判断题】
梁弯曲时，横截面中性轴处的剪应力为零。
【判断题】
当梁横截面上的剪力为零时，所对应横截面上的弯矩也为零。
【判断题】
当梁横截面上的剪力最大时，所对应横截面上的弯矩也最大。
【单选题】
下列不属于力的三要素的是___。
A. 作用点
B. 方向
C. 作用线
D. 大小
【单选题】
下列哪种方法___能提高梁弯曲承载力。
A. 变连续梁为简支梁
B. 增加梁截面高度
C. 变均布荷载为集中荷载
D. 增加梁的计算跨度
【单选题】
以下几种变形形式中不属于四种基本变形形式的是___。
【单选题】
矩形截面梁剪切弯曲时，在横截面的中性轴处___
A. 正应力最大，剪应力为零
B. 正应力为零，剪应力最大
C. 正应力和剪应力均最大
D. 正应力和剪应力均为零
【单选题】
压杆的柔度集中地反映了压杆的___对临界应力的影响
A. 长度、约束条件、截面形状和尺寸
B. 材料、长度和约束条件
C. 材料、约束条件、截面形状和尺寸
D. 材料、长度、截面尺寸和形状
【单选题】
若将圆形截面杆件的直径增加一倍，则其极惯性矩是原来的___
A. 2 倍
B. 4 倍
C. 8 倍
D. 16 倍
【单选题】
已知某段梁截面上剪力为大于零的常数，则其对应的弯矩为___
A. 下倾斜直线
B. 上倾斜直线
C. 开口向上的抛物线
D. 开口向下的抛物线
【单选题】
下列说法中错误的是___
A. 杆件变形的基本形式有四种：轴向拉伸（或压缩）、剪切、扭转和弯曲；
B. 当杆件产生轴向拉（压）变形时，横截面沿杆件轴线产生平移；
C. 当圆截面杆件产生扭转变形时，横截面绕杆件轴线转动；
D. 当杆件产生弯曲变形时，横截面绕中性轴弯曲。
【单选题】
欧拉公式的适用范围为___
A. λ≤0
B. 0<λ<λs
C. λs ≤λ<λp
D. λ≥λp
【单选题】
力对点之矩与以下因素有关，除了___。
A. 大小
B. 方向
C. 作用线长度
D. 点到力作用线的距离
【单选题】
若将矩形截面梁的高度增加一倍，则其惯性矩是原来的___
A. 2 倍
B. 4 倍
C. 8 倍
D. 16 倍
【单选题】
梁发生平面弯曲时，其横截面绕___转动。
A. 梁的纵轴线
B. 截面形心
C. 中性轴
D. 以上都不对
【单选题】
圆形截面杆件扭转时，最大切应力位于___
A. 圆心
B. 离圆心最远处
C. 无法确定
D. 以上都不对
【单选题】
已知某段梁截面上剪力为零的常数，则其对应的弯矩为___
A. 下倾斜直线
B. 水平直线
C. 开口向上的抛物线
D. 无法确定
【单选题】
按照重要程度,管理信息可划分为___。
A. 战略信息、战术信息、作业信息
B. 外部信息、内部信息
C. 一次信息、二次信息、三次信息
D. 数字信息、图象信息、声音信息
【单选题】
信息___。
A. 是形成知识的基础
B. 是数据的基础
C. 是经过加工后的数据
D. 具有完全性
推荐试题
【单选题】
What does Dr. White say people usually do to make themselves happier? ___
A. Earn more money.
B. Settle in an urban area.
C. Gain fame and popularity.
D. Live in a green environment.
【单选题】
What does Dr. White try to find out about living in a greener urban area? ___
A. How it affects different people.
B. How strong its positive effect is.
C. How long its positive effect lasts.
D. How it benefits people physically.
【单选题】
What did Dr. White’s research reveal about people living in a green environment? ___
A. Their stress was more apparent than real.
B. Their decisions required less deliberation.
C. Their memories were greatly strengthened.
D. Their communication with others improved.
【单选题】
According to Dr. White, what should the government do to build more green spaces in cities? ___
A. Find financial support.
B. Improve urban planning.
C. Involve local residents in the effort.
D. Raise public awareness of the issue.
【单选题】
The survey by the Kaiser Family Foundation is mentioned to illustrate the idea that . ___
A. kids don’t always follow parents’ rules
B. only few parents believe the good news
C. much media use results in bad health
D. parents’ rules make a huge difference
【单选题】
What did the kids do when parents set any time or content limits, according to the Kaiser Family Foundation? ___
A. They cut down on their screen time.
B. They appreciated their parents’ love.
C. They spent more time staying outdoor.
D. They accepted parents’ rules unwillingly.
【单选题】
What will Kenneth Ginsburg most probably suggest that parents should do? ___
A. Avoid setting firm rules.
B. Avoid ruling with an iron grip.
C. Set rules after family discussion.
D. Set rules that are easy to understand.
【单选题】
Margaret Broe -Fitzpatrick finds it impossible. ___
A. to achieve just- right parenting
B. to keep track of everything done by the kids
C. for the kids to face rules alone
D. for the kids to observe rules without protest
【单选题】
The passage is mainly intended for parents . ___
A. whose kids have difficulty in self- discipline
B. whose kids are addicted to media use
C. who have doubts about setting rules
D. who are too busy to care for their kids
【单选题】
The word “it” (Para. 2) most probably refers to. ___
A. the lack of stable communities
B. the breakdown of informal information channels
C. the increased mobility of families
D. the growing number of people moving from place to place
【单选题】
The main problem people may encounter today arises from the fact that . ___
A. they have to learn new things consciously
B. they lack the confidence of securing reliable and trustworthy information
C. they have difficulty obtaining the needed information readily
D. they can hardly carry out casual communications with an extended family
【单选题】
From the passage we can infer that _______. ___
A. electronic mail will soon play a dominant role in transmitting messages
B. it will become more difficult for people to keep secrets in an information era
C. people will spend less time holding meetings or conferences
D. events will be reported on the spot mainly through satellites
【单选题】
Technology facilitates _______. ___
A. sharing information
B. storing and sending information
C. providing people with easy access to more information
D. all of the above
【单选题】
We can learn from the last paragraph that _______. ___
A. it is necessary to obtain as much
B. people should make the best use of the information
C. we should realize the importance of accumulating information
D. it is of vital importance to acquire needed information efficiently
【单选题】
The author thinks that people are _________. ___
A. satisfied with their appearance
B. concerned about appearance in old age
C. far from neglecting what is in fashion
D. reluctant to follow the trends in fashion
【单选题】
Fashion magazines and TV advertisements seem to link fashion to _________. ___
A. confidence in life
B. personal dress
C. individual hair style
D. personal future
【单选题】
Causes of fashions are _________. ___
A. uniform
B. varied
C. unknown
D. inexplicable
【单选题】
Present-day society is much freer and easier because it emphasizes _________. ___
A. uniformity
B. formality
C. informality
D. individuality
【单选题】
Which is the main idea of the last paragraph? ______________ ___
A. Care about appearance in formal situations.
B. Fashion in formal and informal situations.
C. Ignoring appearance in informal situations.
D. Ignoring appearance in all situations.
【单选题】
Permissive parents would ________. ___
A. let their children read any books they like to
B. not let their children see any films they like to
C. not let their children read any books without first checking their contents
D. let their children see the films with their first checking
【单选题】
The fact that parents check the contents of the book or the film for their children to read or see shows __________. ___
A. the necessity of censorship
B. that many books and films are bad
C. that children need their parents to help them understand more
D. that the parents are permissive
【单选题】
Which of the following statements is NOT true?____________ ___
A. Some adults can’t tell right from wrong.
B. Censorship is compared to the law because both of them perform good service to society as a whole.
C. Censors pay attention only to genuine works of art.
D. Censorship is necessary because many books, plays and films are far from being “works of art”.
【单选题】
What does the word “corrupt” in Para.4 mean?__________ ___
A. Make morally bad.
B. Hurt.
C. Injure.
D. Damage.
【单选题】
What would be the best title of this passage?_____________ ___
A. Permissive Parents and Responsible Parents.
B. Censorship and the Law.
C. Censors Value Artistic Merits .
D. Censorship Performs Good Service to Society.
【单选题】
Lie detectors are widely used in the United States because _____________. ___
A. they can help detect people’s emotional stress
B. they can help detect people's physiological changes
C. they can help find out whether a person is telling the truth or not
D. they can measure the subject’s electrical resistance
【单选题】
According to the passage, we know that Britain______________. ___
A. will adopt lie detectors widely
B. will adopt lie detectors on a smaller scale
C. adopt lie detectors
D. has not decided whether to adopt lie detectors or not
【单选题】
The tests themselves are by no means free from error..." (Line 1-2.Para.3) means ____________. ___
A. the tests definitely have no error
B. the tests sometimes make mistakes
C. the polygraphers do not make mistakes
D. the polygraphers can avoid error by using some techniques
【单选题】
Which of the following is true? ________________ ___
A. The tests are conducted by qualified polygraphers.
B. Innocent people may blush or stammer when questioned.
C. Guilty people can definitely be found out by answer questions
D. Guilty people may escape by refusing to answer questions.
【单选题】
What troubles lie detector researchers most is that _______________. ___
A. innocent people are convicted crimes
B. innocent people will learn to tell lies
C. lie detectors may cause industrial unrests
D. lie detectors are sometimes not dependable
【单选题】
In the passage the author's attitude towards "mixed-ability teaching" is _______. ___
A. critical
B. questioning
C. approving
D. objective
【单选题】
By "held back" (Line 1) the author means _____. ___
A. made to remain in the same classes
B. forced to study in the lower classes
C. drawn to their studies
D. prevented from advancing
【单选题】
The author argues that a teacher's chief concern should be the development of the student's _________. ___
A. personal qualities and social skills
B. total personality
C. learning ability and communicative skills
D. intellectual ability
【单选题】
Which of the following is NOT MENTIONED in the third paragraph? __________ ___
A. Group work gives pupils the opportunity to learn to work together with others.
B. Pupils also learn to develop their reasoning abilities.
C. Group work provides pupils with the opportunity to learn to be capable organizers.
D. Pupils also learn how to participate in teaching activities.
【单选题】
The author's purpose in writing this passage is to ______. ___
A. argue for teaching bright and not-so-bright pupils in the same class
B. recommend pair work and group work for classroom activities
C. offer advice on the proper use of the library
D. emphasize the importance of appropriate formal classroom teaching
【单选题】
According to the author, the deaths among youth are mainly caused by _____. ___
A. traffic accidents
B. smoking-related diseases
C. murder
D. all of these
【单选题】
Every day there are over_____high school students who will become regular smoker. ___
A. 75
B. 23
C. 30
D. 3000
【单选题】
By "dropout" the author means______. ___
A. students who failed the examination
B. students who left school
C. students who lost their way
D. students who were driven out of school
【单选题】
The reason for declining adolescent smoking is that ________. ___
A. NCI has taken effective measures
B. smoking is prevented among high school seniors
C. there are many smokers who have died of cancer
D. not stated
【单选题】
What is implied but not stated by the author is that ________. ___
A. smoking rates among youth have declined very little
B. there are now more female than male smokers among high school seniors
C. high smoking rates are due to the increase in wealth
D. smokers at high school are from low socio-economic backgrounds
【单选题】
According to the passage, which of the following is NOT a disadvantage of part time education? _______________ ___
A. It requires some break in one's career.
B. It tends to last too long for many people to complete a degree program.
C. It affects one's career.
D. It gives the student less time to share with the family.
