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毎日1問、正解者には6つの富を、参加者には2つの富をプレゼント;9月20日

2016-09-20View Original

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単一選択問題: ( )は廃水処理でよく使用される有機高分子凝集剤です。 A. 聚合塩化アルミニウム B. 聚合塩化鉄 C. ポリ塩化ビニル D. 聚丙烯酰胺 答え:D. 聚丙烯酰胺

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