backing vacuum
英 [ˈbækɪŋ ˈvækjuːm]
美 [ˈbækɪŋ ˈvækjuːm]
前级真空
双语例句
- Study on the backing velocity of the vacuum booster
汽车真空助力器回程速度的研究 - In the multistation exhaust system a mechanic pump is used as the backing pump and molecular pump as the main integral part to form a high vacuum system.
由机械泵为前级泵，分子泵为主抽泵构成高真空系统，对高压开关管进行真空排气； - Rotary piston pumps always used as backing pumps of vacuum systems in vacuum induction ovens.
真空感应炉真空机组中的前级泵，历来使用滑阀泵。