forepumping

常见例句

• Keywords vacuum reaction stove;vacuum degree;master pump;forepump;smelting;modification;
  真空感应炉;真空度;主泵;前级泵;熔炼;改造;
• mechanical forepump
  机械预抽真空泵
• forepump
  n. 预抽真空泵(前级泵)
• vacuum forepump
  前置真空泵
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