单选题:有封闭内院或且井的建筑物沿街时,应设置连通街道和内院的人行通道(可利用楼梯间),其间距不宜大于(  )

题目内容:

有封闭内院或且井的建筑物沿街时,应设置连通街道和内院的人行通道(可利用楼梯间),其间距不宜大于(  ) A.60m
B.70m
C.80m
D.90m

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