短語詞組短語excitation arc current 勵弧電流excitation forcing current ratio 強(qiáng)勵電流倍數(shù)excitation inrush current identification 勵磁涌流辨識excitation n current 激勵電流excitation electric current 勵磁電流excitation surge current 勵磁涌流force excitation surge current 強(qiáng)迫性勵磁涌流 返回 excitation current