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【单选题】
空气反冲式自清洗滤器控制电路如图7-7所示,对某个滤筒正进行清洗的条件是_。A.
驱动旋转本体的电机M通电
B.
控制清洗的电磁阀断电
C.
进出口滑油压差压力开关△P 1闭合,延时继电器RT通电,且在延时时间内
D.
△P1断开且RT断电
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【简答题】Sometimes I feel that being the mother of three small children is like operating a large circus(马戏团).21 afternoon last week，my three sons playing peacefully in the back yard(院子)，22 the ball from one t...
【单选题】听力原文：W: Hello, Kevin. I haven't seen you for many days. What's the problem with you? M: Actually I'm a little embarrassed about coming here. I feel fine right now. (23)But you know, every year around ...
A.
He gets ill at the same time every year.
B.
He doesn't get enough exercise.
C.
He often has difficulty sleeping.
D.
He's sick with influenza throughout the winter.
【简答题】作动筒属于飞机液压系统的( )元件。
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