短語詞組短語bar r commutator 銅條式互換器commutator bar [電]整流條;整連;換向片;集電極commutator bar assembly 整流片組commutator bar pitch 換向片節(jié)距commutator bar slot 換向片槽number of commutator bar 換向片數(shù)high commutator bar 整流條高出low commutator bar 整流條低下copper commutator bar 整流子銅棒 返回 bar commutator