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【单选题】
下面说法正确的是()。A.
直流电机无电刷一样可以工作。
B.
电刷随直流电机转轴一起旋转。
C.
由于气隙的磁导率很小,因此定子与转子之间的气隙中基本没有磁力线。
D.
直流电机的机座既起到支撑作用另外还是磁路的一部分。
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反馈参考答案：
举一反三
【单选题】When I was a boy, I often ______ to play in that park.
A.
went
B.
have gone
C.
go
D.
will go
【简答题】My boy pretended to do his homework when I entered his room.
【单选题】--Have you ever been to Beijing?---Yes, and I still remember ___ there when I was a little boy.
A.
to take
B.
to be taken
C.
taking
D.
being taken
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