Method: Systematic solvent method is used to extract and silica gel drycolumn sheet gradation was used to separate the chemical composition.
方法：采用系统溶剂法提取，硅胶干柱层析法进行化学成分分离。
2
Statistical analysis indicated that there was no significant difference in the results between the two methods, but the drycolumn method was rapid and simple.
统计检验表明，两方法间不存在显著性差异，但干柱法更加快速、简便。
3
During the installation of the oil sealed dry type gas tank, the demand of mounting precision for foundation column is very high.