电动机的转速是通过改变____,即改变定子绕组的____实现。
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电动机产生的磁极对数减少一半时,电机的转速提高___倍
想实现绕组连接方法的自动改变,可以在控制电路中接入____电器元件。
At least 5000 people were killed, and that's aconservative ______.
A. estimate
B. arithmatic
C. campaign
D. applaud
There may be some _____ changes to the schedule.
A. tricky
B. minor
C. ultimate
D. original