泵的抽气速率与气体的性质有关.Lashing velocity of pump is concerned with nature of air.现在已经采用了低温吸附技术和吸气离子泵的近代电子抽气设备.Recent electronic means of pumping using low temperature sorption techniques and getter - ion pumps have been introduce...
The weapons are undergoing ballistics tests to see whether they were used in the shootings.这些武器正在接受弹道测试，以确定它们是否曾用于枪击案中。Ballistics was used in the criminal case to determine the gun's firing capacity.在该刑事案件中人们运用弹道学原理...
我试着回忆在这里度过的所有美好时光。I try to remember all the good times I've had here.狐狸、獾、黄鼠狼和白鼬在这里很常见。Fox, badger, weasel and stoat are regularly seen here.路在这里分了岔；你应该走右边一条。The road divides; you should take the right fork....
利用空化喷咀来产生“空泡”是获得“空化水射流”的简便方法.Some jets pulsed jet , cavitating jet, abrasive water jet are introduced.磨料水射流的性能主要取决于磨料颗粒的冲击速度.The performance of abrasive waterjet depends on the impact velocity of abrasive.在低速射流的预混火焰和扩散火焰...