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。
Zt - b series welding type vacuum flow regulating valve fulfills the flow adjustment purpose by changing the size of the pipeline inner sectional area Zt b型系列焊接式真空流量调节阀是改变管道内截面积大小达到调节流量目的。适用溴化理冷热机组管道。
