forepumping

常见例句

• Keywords vacuum reaction stove;vacuum degree;master pump;forepump;smelting;modification;
  真空感應爐;真空度;主泵;前級泵;熔鍊;改造;
• mechanical forepump
  機械預抽真空泵
• forepump
  n. 預抽真空泵(前級泵)
• vacuum forepump
  前置真空泵
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