短語詞組短語pumping -unit motor 抽油機(jī)電機(jī)beam double -well pumping-unit 遊梁式雙井抽油機(jī)beam -pumping unit 遊梁式抽油機(jī)order -pumping unit 遊梁式抽油機(jī)conventional beam -pumping unit 常槼遊梁式抽油機(jī)folding beam -pumping unit 折梁式抽油機(jī)rod beam -pumping unit 桿式抽油機(jī)new type beam -pumping unit 異形遊梁式抽油機(jī) 返回 pumping unit