问题 问答题 简答题

使用兆欧表进行测量的注意事项有哪些?

答案

参考答案:

(1)连接接线柱与被测物的两根导线不能用绞线,应分开单独连线,以防因绞线绝缘不良而影响读数。

(2)转动摇柄时由慢渐快达到并保持120r/min的稳定转速,若指针已指零时不允许继续摇动,以防线圈损坏。

(3)严禁在雷电或附近有带高压导体设备时测量,不准在设备带电时进行测量。(4)在进行测量前后,对被测物一定要进行充分放电,以保障设备及人身安全。

阅读理解

阅读理解。

     Man has a big brain(大脑). He can think, learn and speak. Scientist once thought that men are

different from animals because they could think and learn. They know now that dogs, rats, birds can

learn too. They are beginning to understand that men are different from animals because they can speak.

      Animals can not speak. They make noises when they are afraid, or angry or unhappy. Apes

(类人猿) can understand some things more quickly than men. One or two of them have learnt a few

words. But they can not put words together to make sentences. They cannot think as we do because

they have no languages. The language is a wonderful thing. Man is able to build a modern world

because he has language.

     Each child can speak his own language very well when he is four or five, but no animal learns to

speak. How do children learn it? Scientists don't know. They only know that man can speak because

he has the brain.

1. The best topic(标题)for this passage is ______.

A. Animals' learning

B. Man and Ape

C. Brain and Language

D. Man's Brain

2. Men are different from animals in the way that ______.

A. men can understand things quickly

B. men can learn

C. men learn to use language

D. men have brain

3. An ape can not ______.

A. make noises

B. understand things

C. learn words

D. speak like a man

4. Scientists now know ______.

A. how children learn to speak

B. why apes can learn a few words

C. man's brain helps him learn to speak

D. what happens when people speak

5. Which of the following is not true?

A. Apes can understand some things more quickly than men.

B. Apes have no language though(尽管) they can learn some words

C. Apes can put together the words they know

D. Some animals can learn.

解答题