物質の溶解度
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私たちの工場にあるカーボン5輸送ポンプの入口フィルターが頻繁に詰まってしまいます。フィルターを開けてみると、フィルターの表面には厚く粘着性の高い暗黄色の物質が付着しており、油を使っても落ちず、水で流せばすぐに取れます。皆さん、これは一体何の物質でしょうか？
上の人の言う通りだ:$:$:$
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