短语词组短語oil l pumping can 泵式油壺oil free pumping 無油排氣oil -pumping 油電泵oil fuel pumping units 燃油泵組oil well pumping 抽油泵oil transporting pumping station 輸油泵站producing oil well pumping 抽油井oil l pumping unit 抽油機 返回 oil pumping