未知题型
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某组分在以丙酮作展开剂进行吸附薄层色谱分析时,Rf值太小,欲提高该组分的Rf值,应选择的展开剂是() A.乙醇...
单项选择题某组分在以丙酮作展开剂进行吸附薄层色谱分析时,Rf值太小,欲提高该组分的Rf值,应选择的展开剂是()
If G is an Abelian group of order 60 which has exactly ...
单项选择题If G is an Abelian group of order 60 which has exactly three elements of order 2, then G is isomorphic to a direct product of and. ( )
在薄层色谱中,组分Rf的最佳范围是() A.0.2~0.8B.0~1C.0.3~0.5D.大于1.5
单项选择题在薄层色谱中,组分Rf的最佳范围是()