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...
It has a dormer roof joining both gable ends.带天窗的斜屋顶连接着两边的山墙。A round or oval dormer window.一圆形或椭圆形的装饰窗.A dormer breaks the level roof.老虎窗破坏了房屋平顶的完整性....
Glycolate oxidase catalyzes the oxidation of glycolate to glyoxylate.乙醇酸氧化酶能高效催化乙醇酸氧化生成一种重要的有机化工中间体乙醛酸.L - Methyl glyoxylate is an important chiral reagent.二羟乙酸L-薄荷酯是一种重要的手性试剂....