A.10° B.12° C.15° D.20°
A.繞組 B.鐵芯 C.繞組和鐵芯 D.上述說法都不對(duì)
A.相位差為零 B.線電流超前相電流30° C.相電流超前相應(yīng)線電流30° D.同相位