The empirical relationship of the differences was obtained using nonlinear regression method and verified with the determined data.
用非线性回归方法得出了水样不同处理方式下总磷间的经验关系式，并进行了验证。
According to the results, an empirical relationship of the rill wetted perimeter with the flow discharge and the slope gradient is obtained by the regression analysis.
通过对试验数据的回归分析，得到了细沟过流湿周同流量及坡度的经验关系。
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