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The variograms of arsenic persistently increased and could be fitted by exponential equation.
土壤砷含量半方差值呈有规律持续增加趋势，可用指数方程很好地拟合。
The results show that the COD at the inflow and outflow follows the rule of exponential equation.
结果表明，湿地进出水COD服从指数方程规律。
Through mathematic analysis, the author of this paper comes to a conclusion that negative exponential equation can not be used to elucidate the regularity of the settling of suspended matter.
通过数学分析，结论是：不能采用负指数方程描述悬浮物的沉降规律。
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