improved water quality index method
improved water quality index method
改进水质指数法
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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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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