问题 问答题 简答题

使用双电桥应注意些什么?

答案

参考答案:

使用双电桥除应遵守单电桥使用的注意事项外,还应注意如下几点:

既被测电阻电位接头P1、P2和电流头C1、C2。在测量时,P1、P2的引线应比C1、C2更靠近被测电阻。连接线应选用较粗导线,导线接头应接触紧密。

阅读理解

阅读理解。

     A recent report from Dazhou Daily says about 18% of Dazhou teenagers can have problems with

their minds (内心,精神).  Some students become worried because they have to study very hard.

Others have trouble getting on well with people like their parents and classmates.

    Zhang Qiang, a Junior 2 student from Dazhou, could not understand his teachers in class and was

doing badly in his lessons.  He was afraid of exams. When he looked at the exam paper, he couldn't

think of anything to write.

    Another student, a 15-year-old girl called Wu Yan from Guang'an often argued with her classmates

even her parents because of some different ideas. She became so annoyed about them that she started

to cut her finger with a knife.

    However, many students who have problems won't go for advice or help.  Some think they will look

stupid (愚蠢的)  if they go to see a doctor. Others don't want to talk about their secrets. In order to

solve the teenagers' problems, here is some advice:

* Talk to your parents or teachers often.

* Take part in group activities and play sports.

* Go to see a doctor if you feel unhappy or unwell.

1.  It is reported that ______students in Dazhou can have problems with their minds.          

A. most                      

B. many

C. some                      

D. all the

2. From the passage we know teenagers have problems with their minds because of ______.        

A. their study

B. getting on with other people

C. their hobbies

D. A and B

3.Wu Yan started to cut her finger with a knife because______.        

A. she couldn't get on well with her classmates and even her parents

B. she could not understand her teachers in class

C. she was afraid of exams

D. she had no money for a new shirt 

4. Why don't the students who have problems want to go for help?       

A. Because they think no one will help them.

B. Because they don't want to talk about their secrets and they think it's stupid to see a doctor.

C. Because they think they can solve the problems by themselves.

D. Because they think the doctors could do nothing with their problems.

5. How many pieces of advice are given to the teenagers who have problems in this passage?

A. Two.                  

B. Three.

C. Four.                  

D. Five.

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