【毎日一題】2017.9.14
Thread Content
機器や容器の内部で火を使う際は、酸素濃度は18％以上でなければならない。判断問題 答え：正解
機器や容器の内部で火を使う際は、酸素濃度は18％以上でなければならない。（対）
正解 装置や容器の内部で火を使う際、その中の酸素濃度は18％以上でなければならない。（V）
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