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问题 多项选择题

六氟化硫断路器正常运行维护时、检查重点是（）、检查绝缘套管有无裂纹、放电及脏污现象。

A.声音

B.对水分的监视

C.电压

D.对SF6气体压力的监视

答案

参考答案：A, B, D

句型转换

1. I’ve been swimming since two hours ago. (就画线部分提问)

                                             you been swimming?  

2. She doesn’t want that pen. She wants this one. (改为同义句)

She wants this pen                             that one.

3. He worked here three years ago.（用since three years ago改写句子）

He                             here since three years ago.

4. The weather was very hot yesterday,                  ? （完成下列反意疑问句）

5.Would you mind wearing those old jeans?(改为否定句)

Would you                                    those old jeans?
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