Classification extraction

• 分级提取

Classification extraction的用法和样例：

例句

1. Sequential extraction procedure was used for the extraction of the vertical of phosphorus form in the sediment of the Fuzhou West Lake.
   采用化学连续提取法对福州西湖两个柱状沉积物样品中垂向不同形态磷进行分级提取分析。