真空感应炉真空机组中的前级泵，历来使用滑阀泵。
Rotary piston pumps always used as backing pumps of vacuum systems in vacuum induction ovens.
本机组采用罗茨泵作为主泵，以旋片式真空泵作为前级泵。
The set takes Roots pump as its main pump and spinning vacuum pump as pre-stage pump.
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；
Used either solely as Rough Pumps, or in combination with other high vacuum pumps as Backing Pumps.
它可以单独使用，也可作为增压泵、扩散泵、分子泵的前级泵使用。
It can be used alone, but also as a booster pump, the proliferation of pumps, pump-pump using the former.
它可以单独使用，也可作为增压泵、扩散泵、分子泵的前级泵使用。
It can be used alone, can also be used as booster pumps, diffusion pumps, molecular pumps pump before use.
在前级泵与主泵中间串联一个电磁真空充气阀，随前级泵开关而启闭。
In between, an electromagnetic vacuum inflation valve is installed in series, which opens and closes with the switch of the pre-stage pump.
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。
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.
所以，它适用于作扩散泵的前级泵，而且更适用于精密仪器配套和实验室使用。
Therefore, it applies to diffusion pump for the pre-pump, but also for supporting precision instruments and laboratory use.
所以，它适用于作扩散泵的前级泵，而且更适用于精密仪器配套和实验室使用。
Therefore, it applies to the proliferation of pumps for the first pump, but also applies to supporting precision instruments and laboratory use.
由于罗茨泵是一种无内压缩的真空泵，通常压缩比很低，故高、中真空泵需要前级泵。
As the Roots pump is a non-vacuum inside the compression, the compression ratio is usually very low, so high, medium and vacuum pumps need to pump before.
在涡轮分子泵的前级侧充气，能强制使碳氢化合物立刻通过涡轮分子泵流入真空室。
Turbo molecular pump in the first grade side of the inflatable, can force the hydrocarbons into the immediate adoption of turbo-molecular pump chamber.
本文研究单级铒镱共掺光纤放大器，采用前向侧面泵浦技术。
This paper studies the single-stage Erbium-ytterbium co-doped fiber amplifier, using the forward side-pumping technology.
本文研究单级铒镱共掺光纤放大器，采用前向侧面泵浦技术。
This paper studies the single-stage Erbium-ytterbium co-doped fiber amplifier, using the forward side-pumping technology.
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