短語詞組短語beam engine pump 橫梁發(fā)動機(jī)泵balance beam engine pump 發(fā)動機(jī)平衡桿泵beam balanced pump 游梁式抽油機(jī)beam -pump unit 游梁式抽油機(jī)balance e beam engine pump 發(fā)動機(jī)平衡桿泵walking beam pump 桿式泵beam pump well 桿泵井;游梁式抽油井beam pump unit 游梁抽油機(jī)walking beam pump coupling 桿式泵聯(lián)軸器 返回 beam pump