单项选择题
A.15° B.30° C.45° D.60°
A.12m;15m B.10m;15m C.12m;18m D.15m;18m
A.分隔防火分区;疏散通道 B.分隔防火分区;分隔防火分区 C.疏散通道;疏散通道 D.疏散通道;分隔防火分区
A.100s B.120s C.150s D.180s
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