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.
在真空系统中，这种泵可单独使用，或作为增压泵、扩散泵等的前级泵。
Use: May serve as the transmission in the oil transfer system, the booster pump.
在真空系统中，这种泵可单独使用，或作为增压泵、扩散泵等的前级泵。
Use: May serve as the transmission in the oil transfer system, the booster pump.
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