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问题 问答题 简答题

什么叫断路器？其作用是什么？

答案

参考答案：

断路器是具有相当完善的灭弧装置和足够的断流能力的电气设备。用于切合空载、负载的线路或其他电气设备以及切断短路电流。

判断题

可行性研究的调查研究主要从市场调查和社会调查两方面进行。 ( )
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改错题

短文改错。

     When I was in high school, most of my friend had bicycles. I hoped I could also have it. One day I

saw a second-hand bicycle, that was only one hundred Yuan. I asked my father the money. But he said he

could only give me half of the money. He should find the other half myself. So I went to sell newspapers

after the school. My father was pleasing when I showed him the money a month after. He gives me the

other fifty. You can imagine what happy I was when I rode to school on my own bicycle.

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