The linear correlation and the stepwise regression methods were used to analyze the cause of formation of the characteristics of the nitrogen pollution.
运用线性相关和逐步回归等方法，分析氮素污染特征的成因。
Quality of drinking water is evaluated comprehensively in Miquan City, the main pollution factors are determined and its cause of formation and corresponding countermeasures are discussed.
对米泉市历年生活饮用水的水质进行综合评价，确定主要污染因子，初步探讨了其成因及采取的对策。
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