在这几页上同时画上横线和竖线,以便制作图表.Line the pages for the graph both horizontally and vertically.图上部的横线段表示陆地.The bars across the top of the figures show the land area.横线就在金属表面划线表示.The lines are supposed to scratched the surface the m...
Conclusion: Silica gel column chromatography and crystallization are simple and rapid Methods: To isolate gardenoside.结论: 柱层析和重结晶方法是简单、速分离栀子苷的有效办法.This paper advances the preparation method of erucamide by direct ammonol...