石菖蒲挥发油中α-细辛醚、β-细辛醚、欧细辛醚三者的分离最好采用()
A.纸层析
B.聚酰胺层析
C.硅胶层析
D.硼酸-硅胶层析
E.硝酸银-硅胶层析
参考答案:E
A.白磷
B.臭氧
C.晶体硅
D.金刚石
() is the place to store the goods imported or in transit, without paying under custom’s supervision
A.Boned warehouse
B.Exported warehouse
C.Imported warehouse
D.Customs warehouse