Methods: This study adopts the experimental group and control group before and after the test design.
方法：本研究采取实验组、对照组前后测设计。
This study adopts the researching methods of class observation and questionnaires to obtain data concerned systematically.
研究中采用了课堂观察和开放式问卷调查的研究方法系统地获得研究的数据信息。
This study adopts the solvent without sulphur to research the extraction technology. As a result, a satisfactory result has been obtained in laboratory.
本项研究采用不含硫的溶剂对浸出工艺进行研究，在实验室条件下获得满意结果。
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