对继电保护及电网安全自动装置试验所用仪表有什么规定？
参考答案：
试验工作应注意选用合适的仪表，整定试验所用仪表的精确度应为0.5级，测量继电器内部回路所用的仪表应保证不致破坏该回路参数值。如并接于电压回路上的，应用高内阻仪表；若测量电压小于1V，应用电子毫伏表或数字型电表；串接于电流回路中的，应用低内阻仪表；测定绝缘电阻，一般情况下用1000V兆欧表进行。
| 阅读理解。 |
| Everyone needs friends. We all like to feel close to someone. It is nice to have a friend to talk, laugh, and do things with. Surely, there are times when we need to be alone. We don't always want people around. But we would feel lonely if we never had a friend. No two people are the same. Sometimes friends don't get along well. That doesn't mean that they no longer like each other. Most of the time they will make up (和解) and go on being friends. Sometimes friends move away. Then we feel very sad. We miss them very much. But we can call them and write to them. It is possible that we will even see them again. And we can make new friends. It is surprising to find out how much we like new people when we get to know them. Families sometimes name their children after a close friend. Many places are named after men and women who have been friendly to people in a town. Some libraries are named this way. So are some schools. We think of these people when we go to these places. There's more good news for people who have friends. They live longer than people who don't. Why? It could be that they are happier. Being happy helps you stay well. Or it could be just knowing that someone cares. If someone cares about you, you take better care of yourself. |
| 1. The first paragraph tells us . |
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| A. nobody needs friends B. we always need friends around C. making friends is a need in people's lives D. we never need to be alone |
| 2. Which of the following is NOT true according to the passage? |
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| A. People are not happy when their friends leave them. B. People will never see their friends after their friends move away. C. People can know their friends in different ways. D. People like to make new friends if they get to know them. |
| 3. The passage mainly tells us . |
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| A. that people needs friends B. that people are all friends C. how to get to know friends D. how name a place |