短語詞組短語return sludge pump 回流污泥泵boiler return circulating pump 鍋爐回水循環(huán)泵return drain pump 疏水泵return flow pump relay 回油泵繼電器return sludge pump coupling 回流污泥泵聯(lián)軸器return pressure pump relay 返回壓力泵繼電器return -pump E 回壓油泵Oil return by pump reversal 泵浦反轉回油 返回 return pump