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【单选题】
交流电动机的倒拉反接制动适用于哪一种交流电动机的哪一种调速?A.
鼠笼式异步电动机的调压调速
B.
鼠笼式异步电动机的变极调速
C.
绕线式异步电动机定子电路串电阻调速
D.
绕线式异步电动机转子电路串电阻调速
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举一反三
【单选题】The age that head circumference equal to chest circumference is :
A.
at birth
B.
6 months
C.
12 months
D.
18 months
E.
24months
【单选题】A: ______B: I've got a headache and felt dizzy.
A.
Do you have anything to declare, sir?
B.
Good morning. May I help you?
C.
How have you been getting along recently?
D.
What seems to be the problem?
【单选题】Why was Dizzy Gillespie regarded as a 'secret sonic weapon' in 1956?
A.
He was deployed to help the U.S. gain the victory of the cold war.
B.
He was assigned to beat enemies at the peak of the cold war.
C.
He had the power to influence the world during the cold war.
D.
He could help to reshape a new image of American culture to the world.
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