A.0<α<π/2 B.0<α<π C.π/2<α<π D.0<α<π/3
A.AC/AC B.DC/DC C.DC/AC D.AC/DC
A.驅(qū)動電路簡單 B.工作頻率低 C.驅(qū)動功率大 D.輸入阻抗低