短語詞組短語return sludge pump 廻流汙泥泵boiler return circulating pump 鍋爐廻水循環(huán)泵return drain pump 疏水泵return flow pump relay 廻油泵繼電器return sludge pump coupling 廻流汙泥泵聯(lián)軸器return pressure pump relay 返廻壓力泵繼電器return -pump E 廻壓油泵Oil return by pump reversal 泵浦反轉(zhuǎn)廻油 返回 return pump