第3章 爆発の基礎知識1
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1、防爆型の防爆電気機器を使用し、火災危険性が甲類のガスを製造・貯蔵する場合、その爆発下限は（） A≤10% B≥10% C＜10% D＞10% 正解：C
正解しても財産はない。なければ、これからは参加しない
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