短語詞組短語residual magnetism measurement 剩磁測定transformer residual magnetism 互感器剩磁maximum residual magnetism [電子]最大剩磁relative residual magnetism 相對剩磁residual magnetism excitation 剩磁勵磁residual magnetism effect 剩磁效應alternator residual magnetism loss 交流發(fā)電機剩磁損失 返回 residual magnetism