短語詞組短語commutation repeal system 減刑撤銷制度mechanical commutation computing system 機械計算機mechanical commutation drive system 機械驅(qū)動系統(tǒng)mechanical commutation conveying system 機械運輸系統(tǒng)Power supply commutation system 供電整流系統(tǒng) 返回 commutation system