毎日1問、正解者には6つの財富を報酬として、参加者には2つの財富を報酬として与えます;第267題
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この投稿は、2015年8月1日21時41分に「永遠に※諦めない」によって最終的に編集されました。判断問題:エチレンガスに一定割合の窒素を混ぜることで、その爆発の危険性を低減できる。( ) 答え:正解
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