撇渣过频或操作不当会使浮渣损失很大.Frequent skimming or improper skimming can cause a much higher dross loss.出铁口通向一条或多条装有撇渣器的铁水沟.The tapholes lead to one or more runners with slag skimmers....
结果运用聚酰胺柱层析一次分离,获得有效成分高良姜素.Results Galangin was obtained step column chromatography of polyamide only once.结果运用聚酰胺柱层析 - 次分离,获得有效成分高良姜素.Results Galangin was obtained by on - step column chromatography of polyamide only onc...
I had to make some nickel - and - dime repairs on my old Chevy.我那辆雪佛兰老爷车需要不少零零星星的修理.A dime is a tenth of a dollar.一角银币是十分之一美元.In the squares place a penny, nickel, dime and quarter in that order. The object is to reverse...