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【简答题】
10在图示电路中,哪个二极管导通?哪个继电器动作?是两个继电器的线圈电阻均为10kΩ,当流过其上的电流大于2mA时动作,并设二极管的正向压降迫忽略不计。
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举一反三
【简答题】按工作原理低压电器分为( )、 ( )。
【单选题】What did the man think he had given to the woman?
A.
An information card of a restaurant.
B.
His own business card.
C.
Mr. Cooper's business card.
D.
A note of what to do.
【简答题】空压机按工作原理可以分为（）、（）。
【单选题】Why didn't he eat anything?
A.
He had forgotten to bring any food with him.
B.
He was afraid he would fall asleep if he should eat anything.
C.
He was not hungry.
D.
It was difficult to eat while flying a plane.
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