vacuum: n.(pl. vacuums, vac-ua )1.真空；空处，空虚，空白。2.〔美口〕吸尘器(＝ vacuum cleaner)。短语和例子a low [partial] vacuum低度[未尽]真空。 feel a vacuum in the lower regions 〔戏谑语〕觉得饿。vi.,vt.〔美口〕1.用吸尘器扫除。2.用真空干燥机干燥。adj.1.真空的。
Vacuum technology ; acceptance specifications for roots vacuum pumps for the range of medium vacuum 真空技术.中等级真空范围用罗茨真空泵的验收规范
2.
Vacuum technology ; acceptance specifications for rotary plunger vacuum pumps , sliding vane rotary vacuum pumps and rotary piston vacuum pumps for the ranges of rough and medium vacuum 真空技术.近似真空和中等真空范围用旋转柱塞真空泵
