相关矩阵及聚类分析表明，煤炭中微量元素与基质元素之间、微量元素之间有着密切的依存性。

Correlation matrix and cluster analysis showed that the trace and major elements, trace and trace elements in coal are closely related.

youdao

相关矩阵及聚类分析表明，煤炭中微量元素与基质元素之间、微量元素之间有着密切的依存性。

Correlation matrix and cluster analysis showed that the trace and major elements, trace and trace elements in coal are closely related.

youdao