当采用专用变压器、TN-S接零保护供电系统的施工现场，电气设备的_爱下问搜题

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问题单项选择题

当采用专用变压器、TN-S接零保护供电系统的施工现场，电气设备的金属外壳必须与()连接。

A.保护地线

B.保护零线

C.工作零线

D.工作地线

答案

参考答案：B

阅读理解

阅读短文，判断对(√)错(×)。

A: What would you like for supper, Amy?

B: I'd like some chicken.

A: Do you like fish?

B: No, I don't.

A: What about soup?

B: Yes, I like it very much.

A: What would Mike like?

B: He'd like some rice and beef.

A: OK. Supper's ready. Help yourself.

B: Thank you, sir.

( ) 1. Amy would like some beef for supper.

( ) 2. Amy likes soup very much.

( ) 3. Mike would like some rice and fish.

( ) 4. They eat lunch together.

判断题

由于近地面风的影响，使用雨量筒测得的降水量总是比实际到达地面的降水量要小。