听力原文:M: I'm about worn out. I've been busy at the office and I've got a stiff neck and sore shoulders. Guess I'm getting old. W: Don't be silly. You just need a good rest. Q: What's the man's real problem? (14)
A.
He has a serious disease.
B.
He's too poor.
C.
He's getting old.
D.
He's overworked.
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【单选题】在机床电力拖动中要求油泵电动机启动后主电动机才能运行,接触器 KM1 控制油泵电动机,接触器 KM2 控制主电动机,则在控制电路中必须( )