Cage-type induction motors have a very poor power factor which may be as low as 0.3-0.4 when
A.
starting
B.
running
C.
at high speed
D.
at full load
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参考答案:
举一反三
【简答题】The astronauts and their achievements __________ you mentioned stimulate the youth much so that some of them are engaged in astronautics. [A]which [B] that [C] what [D] whom