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问题 单项选择题

绝缘工具材质的电气强度不得小于3kV/cm，间接带电作业的绝缘杆等其有效长度大于（）。

A.100mm

B.1000mm

C.10000mm

D.2000mm

答案

参考答案：B

单项选择题

下列装置中不属于运行系统保护装置的是（）。

A、相序保护

B、安全钳动作开关

C、急停开关

D、安全窗
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填空题

用所给单词的正确形式填空。

1. Does Linda agree _____(help) you copy her homework?

2. Students don't like _____(fight)in the classroom.

3. The music teacher taught us _____ (sing) many beautiful songs.

4. There are two _____ (office) languages in Canada.

5. Today is sunny. We can see many kites _____(fly) in the sky.

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