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。
And now the force, in its most general term / is q1q2 over 4 pi epsilon zero, which is the conversion factor r squared.
库仑力的最基本形式,就是,其中r是一个变量。
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