短語(yǔ)詞組短語(yǔ)discontinuous action servo -mechanism 斷續(xù)動(dòng)作的伺服機(jī)構(gòu)joint -action mechanism 聯(lián)動(dòng)機(jī)制compacted base -enlarged action mechanism 夯擴(kuò)機(jī)理 返回 action mechanism