短語詞組短語commutation repeal system 減刑撤銷制度mechanical commutation computing system 機(jī)械計(jì)算機(jī)mechanical commutation drive system 機(jī)械敺動(dòng)系統(tǒng)mechanical commutation conveying system 機(jī)械運(yùn)輸系統(tǒng)Power supply commutation system 供電整流系統(tǒng) 返回 commutation system