常見例句雙語例句It is a positive displacement vacuum pump, which can pump gas by rotating slide valve to change cubage of gas- absorbing cavity.它是通過滑閥轉(zhuǎn)子作機械鏇轉(zhuǎn)運動從而改變吸氣腔容積以達到抽氣目的的容積式真空泵。 返回 vacuum displacement pump