“backing pump”的概念、定义、翻译、参考文献-科学参考

单词	backing pump
释义	backing pump [`bak·iŋ ´pǝmp] ^{MECHANICAL ENGINEERING} A vacuum pump, in a vacuum system using two pumps in tandem, which works directly to the atmosphere and reduces the pressure to an intermediate value, usually between 100 and 0.1 pascals. Also known as fore pump.
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