The water quality of the Beitang Drainage River during these seasons was evaluated by the improved principal component analysis method and Nemerow index method.
运用内梅罗指数法验证了改进的主成分分析法的结论，并得出了三个水期的相对污染程度。
The water quality of the Beitang Drainage River during these seasons was evaluated by the improved principal component analysis method and Nemerow index method.
运用内梅罗指数法验证了改进的主成分分析法的结论，并得出了三个水期的相对污染程度。
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