Four groups of elemental associations and four main factors were obtained respectively by using R-type cluster analysis and R-type factor analysis.

并利用R型聚类分析和R型因子分析，分别提取四组元素组合和四个主因子。

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Four groups of elemental associations and four main factors were obtained respectively by using R-type cluster analysis and R-type factor analysis.

并利用R型聚类分析和R型因子分析，分别提取四组元素组合和四个主因子。

youdao