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backing vacuum pump 前级真空泵
Used either solely as Rough Pumps, or in combination with other high vacuum pumps as Backing Pumps.
可单独作低真空泵用，也可与其他高真空泵组合作前级泵用；
Rotary piston pumps always used as backing pumps of vacuum systems in vacuum induction ovens.
真空感应炉真空机组中的前级泵，历来使用滑阀泵。
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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