抽气泵的排气管应该导向室外空旷处或导向一座通风橱.The pump exhaust should lead to the open air or a fume hood.设计了一套硅片专用真空夹紧装置,包括夹紧装置和微型无油真空抽气泵.A vacuum clamp equipment used for holding Si wafer is designed in this paper....
每条连衣裙都缝上了褶边，并经过严格的检查，不允许有任何瑕疵。Each dress is hemmed and scrupulously checked for imperfections.他们请求香港允许他们在那里入港停留。They had asked Hong Kong for permission to put into port there.目前，14岁以下儿童不允许进酒吧。At present children under 14...