问题 问答题 简答题

在用万用表检查使用中的PT401(ST3000型)变送器的输出电流时,能否将万用表的表笔并联在变送器的两根接线上?为什么?

答案

参考答案:

不能,因为万用表电流档内阻很小,直接并联在变送器的两根接线上,相当于将整个回路短路了,正确的测量是将万用表串联在仪表回路中测量。

阅读理解

阅读表达。阅读短文,按要求完成短文后的任务。

     Many teenagers feel that the most important people in their lives are their friends. 1) They believe that their

family members, and in particular (尤其是) their _____, don't know them as well as their _____ do! In large

families, it is quite normal (正常) for brothers and sisters to fight (打架) with each other and then they can only

go to their friends for advice.

     2) It is very important for a teenager to have a good friend or a circle (圈子) of friends. Even when they are

not with their friends, they usually spend much time talking to each other on the phone. This communication is

very important in children's growing up, because friends can discuss things that are difficult to discuss with their

family members.

     However, parents often try to choose their children's friends for them. Some parents even stop their children

from seeing their good friends. The question of "choice" is an interesting one. Have you ever thought of the

following questions?

     Who choose (选择) your friends? Do you choose your friends or your friends choose you?

     Have you got a good friend your parents don't like?

1. 在1)句的空白处填入适当的词使句意完整、上下文通顺:

    ______________________________________________________________

2. 将2)句译成中文: 

    ______________________________________________________________

3. 回答问题:Who knows teenagers better according to the passage? 

    ______________________________________________________________

4. 在文中画出与下列句子意思相近的句子:

    It usually takes them lots of time to phone each other. 

    ______________________________________________________________

5. 找出文中或写出最能表达该短文主题的句子。 

    ______________________________________________________________

单项选择题 A1/A2型题