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.
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.
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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