單項(xiàng)選擇題三相異步電動機(jī)同步轉(zhuǎn)速為n0,轉(zhuǎn)子轉(zhuǎn)速為n,那么旋轉(zhuǎn)磁場和同步轉(zhuǎn)速間的相對轉(zhuǎn)速是多少?()

A.n0
B.0
C.n0-n
D.n0+n