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【毎日一題 第221題】2020年8月5日

2020-08-12View Original

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この投稿は、2020年8月12日 22:33に緑蓮花によって最終的に編集されました。【毎日一問 第221問】2020年8月5日、粉末状の硫化亜鉄は空気に触れるとより容易に自然発火します。 判断問題() 2日以内に解答してください。

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