问题 问答题 简答题

电动机测绝缘的规定?

答案

参考答案:

1.6KV电动机测绝缘应使用2500V摇表测量绝缘。

2.380V及以下电动机测绝缘应使用500--1000V摇表测量绝缘。

3.直流或绕线式电动机应使用5000V摇表测量绝缘。

4.双速电动机测绝缘时,必须将两路电源开关均拉出才能进行。

5.长期备用的电动机,超过15天,送电启动前应测量绝缘合格后。

阅读理解

阅读理解。

      Manuel came home crying. The children had called him "Fatso" again, and he hated it. He sat down,

and looked very sad. "Don't worry, I'm fat too," said his mother. "But it's me they call Fatso," Manuel

cried. His mother felt very sorry for him. "All right then," she said. "We're both too fat. Let's go on a diet

together." 

      It would not be easy. They both loved bread, cakes, potatoes and chips. To diet, they had to eat salads.

The first day was fun, but by night-time, they felt very hungry. "We won't think about food. Let's think

about airplanes," said his mother. "But I keep seeing chocolate in my mind," Manuel answered. The second

day was hard, for they both thinking about cream cakes. The third was worse. By now they both wanted

to give up. "No, no, we must be strong," said Manuel's mother. 

      Somehow, they kept on dieting for three weeks, and lost a lot of fat. They liked their new hobbies so

much they kept going until they were really slim. After a few months, Manuel enjoyed eating fruit, or nuts

instead of sweets. Nobody called him Fatso any more. Some were calling him Spider Legs-and he loved it.

1. It's clear that the word "diet" in the reading is about           . [ ]

A. one's bad name

B. food for each day

C. flying in the sky

D. cooking at home

2. Manuel and his mother kept thinking about cream cakes because            . [ ]

A. the cakes could help them lose weight

B. they had no other food to eat

C. they liked eating them a lot before

D. the cakes could make them think about airplanes

3. We know from the reading            . [ ]

A. there was no fun at all in losing weight for Manuel

B. Manuel's mother didn't eat cream cakes at all

C. "potatoes and chips" can make people thin

D. Manuel and his mother eat salads to lose weight

4. Manuel's mother felt sorry because             . [ ]

A. her son was too fat

B. Manuel was very sad

C. the other children were not fat

D. Manuel couldn't eat cream cakes any more

5. Manuel loved others calling him Spider Legs because             . [ ]

A. Spider Legs sounds good for him

B. the other children are all Spider Legs

C. he didn't eat cream cakes any more

D. he could eat lots of sweets now

选择题