水処理 毎日一問（12.25）
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メリークリスマス！花を交換しましょう。クイズに答えたら、私にも花を忘れずに送ってください。お返ししますよ！単一選択問題：工場内の「三泥」処理は、遠心分離機に入れる前に濃縮されます。A.一次 B.二次 C.三次 D.四次 選択：A
工場の「三泥」処理は、遠心分離機に入る前にC濃縮が行われた。 A.一次 B.二次 C.三次 D.四次
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