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....
He conjectured that some individuals may be able to detect major calamities.他猜测说有些人也许能够察觉重大灾难。They will only triumph by persevering in their struggle against natural calamities.他们只有坚持与自然灾害搏斗,才能取得胜利.One moment's fals...