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【多选题】
关于电动机的描述，正确的是（ ）。A.
它是鼠笼式三相异步电动机
B.
它采用的是变极调速
C.
它通过改变定子绕组的连接方法来改变定子旋转磁场的磁极对数，从而实现调速。
D.
它实现的是有级调速，调速的平滑性不好。
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A.
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B.
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C.
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