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mechanical vacuum pump造句

"mechanical vacuum pump"是什么意思   

例句與造句

  1. Mechanical vacuum pumps of oil free and its application
    無(wú)油機(jī)械真空泵及其應(yīng)用
  2. Maintenance of mechanical vacuum pump
    油擴(kuò)散泵的維修連載
  3. It's difficult to find mechanical vacuum pump in a sentence. 用mechanical vacuum pump造句挺難的

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