短語詞組短語cascade speed control system 串級調(diào)速系統(tǒng)internal feedback cascade speed control 內(nèi)反饋串級調(diào)速chopper cascade speed control system 斬波串級調(diào)速系統(tǒng)speed cascade control 速度級聯(lián)控制 返回 cascade speed control