单选题二氧化碳灭火系统泄压口是设在防护区（）用以泄放防护区内部超压的开口。A外墙B外墙或顶部C顶部D下部
单选题
二氧化碳灭火系统泄压口是设在防护区（）用以泄放防护区内部超压的开口。
A
外墙
B
外墙或顶部
C
顶部
D
下部
参考解析
解析：
暂无解析
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