单选题:对于单层或多层的民用建筑,当其耐火等级为三级时,建筑层数最多为( )层。

题目内容:
对于单层或多层的民用建筑,当其耐火等级为三级时,建筑层数最多为( )层。 A.2
B.3
C.4
D.5

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