A.1500 B.1800 C.3500 D.3600
A.降低啟動電流 B.降低運轉(zhuǎn)電流 C.產(chǎn)生轉(zhuǎn)矩幫助啟動 D.使運轉(zhuǎn)圓滑
A.2 B.√3 C.1 D.1/3