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。
Measurements of the electrical properties of electronic tubes . part 23 : methods of measurement of vacuum pulse modulator tubes and valves 电子管电性能的测量.第23部分:真空脉冲调制管的测量方法
