1、[机]前级泵
这就是将上述的“单级泵” 或“双级泵” 作于高压侧，被称为“前级泵” (backing pump) ；而用罗茨真空泵（Roots Pump）作为主泵，或称增压泵。
2、[机] [油气]旋转油泵
... backing power 倒车功率，后退功率 backing pump 旋转油泵；初级抽气泵，前置泵；备用泵 backing ring 衬环；垫环；支承环 ...
3、前级真空泵
... backing off tool铲齿车刀 backing pump前级真空泵 backing sand填充砂 ...
4、预抽真空泵
... backing fire 逆风而烧的林野火灾 backing pump 预抽真空泵 backing wind 逆时针转向的风 ...
backing g pump前级泵;预抽真空泵
backing vacuum pump前级真空泵
high-backing pressure pump高背后压力泵
forepump backing pump预抽泵
vacuum backing pump真空旋转泵
backing pump forepump预抽泵
mechanical backing pump前级机械泵
backing pump for molecular pump分子泵的前级泵