【毎日一問】汚水知識-12.24(回答+2、正解+5)
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この投稿は、2015年12月24日11時12分に五郎八卦棍によって最終的に編集されました。単択問題:藻類の死滅と**により、水域内の( )が大幅に減少し、富栄養化が引き起こされます。 A 有機物 B 栄養物質 C 溶存酸素 D 悬濁物
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