... background radiation本底辐射 backing vacuum pump前级真空泵 backscattering后方散射 ...
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vacuum backing pump 真空旋转泵
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This Model Vacuum pump can be used along, or as the backing pump of the other kinds of pumps, such as booster pump, diffusion pump, molecular pump etc.
它可以单独使用，管道泵也可作为增压泵、扩散泵、分子泵的前级泵使用。
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