A.=p B.= C.=s D.=p
A.起動轉(zhuǎn)矩為0 B.起動轉(zhuǎn)向隨機 C.起動電流很小 D.產(chǎn)生單項脈振磁動勢
A.f=(wt)cos[(π/τ)x] B.f=[(π/τ)x-wt] C.f=(wt) D.f=[(π/τ)x]