用台钳夹住叶片测定单片频率时,应注意什么?

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问题:

用台钳夹住叶片测定单片频率时,应注意什么?

考点:汽轮机检修汽轮机本体检修工(综合练习)汽轮机本体检修工(综合练习)题库
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①一个命题的逆命题为真,它的否命题也一定为真;
②在△ABC中,“∠B=60°”是“∠A,∠B,∠C三个角成等差数列”的充要条件.
x>1
y>2
x+y>3
xy>2
的充要条件;
④“am2<bm2”是“a<b”的充分必要条件.
以上说法中,判断错误的有______.
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指导保管人员对药品进行合理储存()

A.小型药品批发和零售连锁企业 

B.大型药品批发和零售连锁企业 

C.企业主要负责人 

D.药品零售药店 

E.执业药师

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预算定额中,各项人工、机械和材料的计量单位选择,相对比较固定,精确度要求高、材料贵重的,经常取( )。

A.两位小数
B.三位小数
C.四位小数
D.五位小数

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Read the following text and choose the most suitable heading from the list A-F for each paragraph. There is one extra heading which you do not need.
A.Necessity for developing adult education
B.Early days of adult education
C.Ways of receiving adult education
D.Growth of adult education
E. Institutions of adult education
F. Functions of adult education
 

 

 
76.

Voluntary learning in organized courses by mature men and women is called adult education. Such education is offered to make people able to enlarge and interpret their experience as adults. Adults may want to study something which they missed in earlier schooling, get new skills or job training, find out about new technological developments, seek better self—understanding, or develop new talents and skills.

 

 
77.  

This kind of education may be in the form of self-study with proper guidance through the use of libraries, correspondence courses, or broadcasting. It may also be acquired collectively in schools and colleges, study groups, workshops, clubs, and professional associations.

 

 
78.

Modern adult education for large numbers of people started in the 18th and 19th centuries with the rise of the Industrial Revolution. Great economic and social changes were taking place: people were moving from rural areas to cities; new types of work were being created in an expanding factory system. These and other factors produced a need for further education and re-education of adults.

 

 
79.

The earliest programs of organized adult education arose in Great Britain in the 1790s, with the founding of an adult school in Nottingham and a mechanics’ institute in Glasgow. The earliest adult education institution in the United States was founded by Benjamin Franklin and some friends in Philadelphia in 1727.

 

 
80.

People recognize that continued learning is necessary for most forms of employment today. For example, parts of the adult population in many countries find it necessary to take part in retraining programs at work or even to learn completely new jobs. Adult education programs are springing up constantly to meet these and other needs.
题型:问答题 简答题

示波器Y轴的RC衰减网络在低频时表现为()。

A.电阻分压器

B.容抗分压器

C.阻容分压器

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