短語詞組短語vacuum m centrifugal pump 離心式真空泵vacuum centrifugal pump detail 真空離心泵centrifugal vacuum pump 離心式真空泵multistage segmental centrifugal vacuum pump 多級分段式離心真空泵Water ring centrifugal vacuum pump 水環(huán)離心真空泵 返回 vacuum centrifugal pump