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水中硝酸盐氮
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水中硝酸盐氮
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工学
废水水质指标
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nitrate nitrogen in water
水中硝酸盐氮
水体中以硝酸盐形式存在的氮元素。硝酸盐氮是含氮有机物经无机化作用最终的分解产物,水中的硝酸盐也可直接来自地层。
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elliptic discriminant
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