短語詞組短語mechanical end face seal 端面密封single mechanical end face seal 單端面機械密封double mechanical end face seal 雙端面密封;雙端面密封英語;翻譯no2contacting mechanical face seal 非接觸式機械密封mechanical face seal computation 機械密封計算upstream pumping mechanical face seal 上游泵送機械密封no contacting mechanical face seal 非接觸式機械密封Mechanical Seal or Face Seal 機械密封non -contacting mechanical face seal 非接觸式機械密封的 返回 mechanical face seal