【11-25】職業健康版 毎日一投
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この投稿は、2016年11月27日10時08分に阿川によって最終的に編集されました。【11-25】職業健康版 毎日一投：炭鉱の作業場所における二酸化炭素の許容濃度は（）％です。みんな、投票しよう！
炭鉱の作業場所における二酸化炭素の最高許容濃度は(0。5 )%
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