是以罗茨泵为主泵，以旋片泵为前级泵串联而成。
Roots pump is the main pump to pump for the former spin-pump series from.
研究了晶闸管控制的分级串联电容换级时的暂态过程。
The transient process of graded series capacitor during grade change controlled by thyristor is studied.
研究了晶闸管控制的分级串联电容换级时的暂态过程。
The transient process of graded series capacitor during grade change controlled by thyristor is studied.
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