forepumping

基本解释

• n.前级抽气(预抽)

同根派生

英汉例句

• 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