引发电气火灾的初始原因是:()A.电源保险丝不起作用 B.带电改接电气线路 C.线路

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问题:

引发电气火灾的初始原因是:()

A.电源保险丝不起作用

B.带电改接电气线路

C.线路或设备过电流运行

D.没有保护性接零或接地

考点:高校实验室安全考试电气电气题库
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"The Chinese Dream" is a hot topic of this year. Many Chinese young people are inspired by the Chinese Dream. Everyone has their 小题1:  dreams. They give us courage and confidence to keep us going t 小题2:  difficulties. Here are some advice on how to 小题3:   our beautiful dreams.

Never g 小题4:  up is the key to make our dreams come true. We may fail from time to time, but we can learn from failure, correct our mistakes and try again until we 小题5:  our goals. Our life is like a long j  小题6:  which is not all roses. It sometimes has wind and rain. We believe rainbows will a 小题7:  after storms.

Cooperation is also 小题8:. Everyone likes a person who is good at cooperating with others. Besides, in our society most problems can't be 小题9:   by one person alone. Cooperation is becoming one of the most important 小题10: for people living in the developing society.

Follow the suggestions above, and our dreams are sure to come true.

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整个社会的生产能力受制于短线部门的有限供给能力,这称为社会生产的()

A、波及效果

B、木桶效应

C、生产诱发

D、需求诱发

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牛郎星和织女星大约相距()光年。

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我国高血压的知晓率是()

A.26.3%

B.30.2%

C.28.9%

D.31.8%

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当錾削距尽头()mm时,必须调头錾削。

A、5

B、10

C、15

D、20

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