I go to bed early, but I stayed up late last night.
A.
simply
B.
accidentally
C.
obviously
D.
normally
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参考答案:
举一反三
【单选题】Winding type asynchronous motor p=3, if the stator current f1=50Hz, rotor speed n=900r/min, the rotor potential frequency f2= _____. Asynchronous motor knowledge f2=sf1, the number of pole pairsp=3,st...