以直径12mm的端铣刀铣削5mm深的孔,结果孔径为12.55mm,其主要原因是()。

题型:单项选择题

问题:

以直径12mm的端铣刀铣削5mm深的孔,结果孔径为12.55mm,其主要原因是()。

A、工件松动;

B、刀具松动;

C、虎钳松动;

D、刀具夹头的中心偏置。

考点:数控机床操作工考试数控机床操作工考试题库
题型:单项选择题
A
Stress (压力) is everywhere in our everyday life. Men, women, the young and the old sometimes have stress.
The most important reasons of stress are: death, diseases, exams, making money, changing jobs, ending friendships and so on.
How do you know whether you have stress? Could you give your answers to the following questions?
 
Yes
No
Do you easily get angry?
 
 
Do you often sleep badly?
 
 
Do you get headaches a lot?
 
 
Do you take sleeping pills?
 
 
Do you find it difficult to relax?
 
 
Do you smoke and drink a lot to keep quiet?
 
 
Do you find it difficult to put your heart into something?
 
 
If you answer “Yes” to more than two of these questions, you are one of those people with stress. So what can you do about it?
Doing relaxing exercise, talking with friends and listening to light music are all usual ways  relieving (减轻) stress. However, doctors now say that there are easier ways — people should laugh and smile more often. When you laugh and smile, your body relaxes. They also say that people, especially men, should cry more often, because crying is the natural way of relieving stress.
小题1:Which of the followings is NOT one of the most important reasons of stress according to the passage?
A.Taking exams. B.Taking sleeping pills.
C.Making money.D.Ending friendships.
小题2:What’s the easier way to relax your body?
A.Talking with friends.B.Doing relaxing exercise.
C.Laughing, smiling and crying.D.Listening to music.
小题3:The main idea of the passage is about _________.
A.a survey of people with stress
B.the reasons for having stress
C.who has stress easily
D.stress and how to relieve your stress
题型:单项选择题

一个企业生产单位构成最终是由()决定,并为企业的生产经营目标服务。

题型:单项选择题

在对互斥方案进行直接比选时,必须具备的可比条件有()。

A.被比较方案的投资额相同或相近

B.被比较方案具有相同的不确定因索

C.被比较方案的费用及效益计算口径一致

D.被比较方案具有相同的计算期

E.被比较方案现金流量具有相同的时间单位

题型:单项选择题

在进行定性诊断时,我们应收集的资料有()

A.起病方式

B.疾病的发生、发展过程

C.疾病对治疗的反应

D.相关的既往史、个人史、家族史

E.相关的辅助检查

题型:单项选择题

为什么保持料筒完全垂直?

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