题目：
生产和储存火灾危险性为甲类的气体，其爆炸下限为（）
A.≤10％
B.≥10％
C.<10％
D.>10％
答案：
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参考答案：D
生产和储存火灾危险性为甲类的气体，其爆炸下限为（） A.≤10％ B.≥10％ C.
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