短語(yǔ)詞組短語(yǔ)air r balanced pumping unit 氣動(dòng)平衡抽油機(jī)air -balanced sucker-rod pumping unit 氣動(dòng)平衡泵桿抽油機(jī);氣動(dòng)平衡抽油機(jī) 返回 air balanced pumping unit