由于分析样品分布不均和采用的测试方法各不相同，本文的数据还不能准确地代表中国煤中微量元素的平均丰度值。

According to the strata about the trace elements in coal of China, the different background value of trace elements in different parts of China wered rew out.

youdao

由于分析样品分布不均和采用的测试方法各不相同，本文的数据还不能准确地代表中国煤中微量元素的平均丰度值。

According to the strata about the trace elements in coal of China, the different background value of trace elements in different parts of China wered rew out.

youdao