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【单选题】
采用全淹没二氧化碳灭火系统的防护区，防护区的围护结构及门、窗的耐火极限不应低于（），吊顶的耐火极限不应低于（）。
A.
0.25h；0.25h
B.
0.50h；0.50h
C.
0.50h；0.25h
D.
1.0h；0.25h
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