We should fold the silica gel and the alumina which needs in the test with the filter paper, and then fold a batch of filer paper to put into the circular extractor ( to take the large size one ) for extracting the pure medicines and filter paper.

• 本实验中所需要的将硅胶和氧化铝用滤纸卷包好，将一叠滤纸卷好，均放入循环萃取器（取大号的）中萃取以获得干净纯净的药品和，滤纸。