单选题:对于旧城区中严重影响城市消防安全的企业且一时不能拆除重建的,可划分防火分区,各分区之间留出不小于( )m的防火通道或设置

题目内容:
对于旧城区中严重影响城市消防安全的企业且一时不能拆除重建的,可划分防火分区,各分区之间留出不小于( )m的防火通道或设置高出建筑屋面不小于( )cm的防火墙。 A.6,50
B.4,50
C.6,100
D.4,100

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