短語(yǔ)詞組短語(yǔ)rotary piston vacuum pump [真空]定片真空泵;滑閥真空泵;廻轉(zhuǎn)式柱塞真空泵Model W Piston Vacuum Pump 式真空泵Piston Vacuum Pump for Liquids 隔膜式液用幫浦 返回 piston vacuum pump