根据《起重机械超载保护装置》（GB12602-2009），装置的防护等级

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问题单项选择题

根据《起重机械超载保护装置》（GB12602-2009），装置的防护等级应符合以下规定，室内部分不应低于（）

A.IP42

B.IP43

C.IP44

D.IP45

答案

参考答案：C

句型转换

把下列直接引语改为间接引语。

1. Mary said, "My sister doesn't want to go there."

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2. John said to me, "I'm doing my homework now."

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3. He said to me, "I can sing in English."

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4. He aksed, "Why are you late for school, Jimmy?"

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5. Lucy said, "I'm going to the beach tomorrow."

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问答题简答题

发电机失步运行对发电机有何不良影响？