A. 采用移相式方波逆变 B. 采用单极性SPWM C. 采用双极性SPWM D. 采用方波逆变
A. 0.45Vd ,0.45Vd B. 0.9Vd ,0.9Vd C. 0.45Vd ,0.9Vd D. 0.9Vd ,0.45Vd填空题简答题