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。
Liquid ring technology - pressure vacuum pump - a vacuum or pressure pump requires no lubrication . for use in oil and gas industry -为化肥化工石油煤碳军工塑料建材等行业提供大型压缩机。