水処理 毎日一問（12.8）
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単一選択：次のうち正しいのは 。A. 重金属元素は活性汚泥の栄養素の一つであるB. 重金属元素は活性汚泥に有害である
C. 重金属元素の含有量は多くても少なくてもいけない
D. 重金属元素は活性汚泥に影響を与えない
B
B. 重金属元素は活性汚泥に有害
B. 重金属元素は活性汚泥に有害
B. 重金属元素は活性汚泥に有害
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