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3128439

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[求助] 求助各位大神,关于面源污染指标问题

各位大神好,
       本人菜鸟一名,想问个小问题,我们做水分污染物检测,然后检测结果显示,天然降雨的总磷指标超过II类水标准,请问这种现象是否存在,还是说这种现象不可能存在,是我们取样出现问题?望各位大神告知,谢谢!
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