单选题:靠外墙的采用自然排烟的防烟楼梯间,每( )层内可开启的外窗总面积之和不应小于( )m2。

题目内容:
靠外墙的采用自然排烟的防烟楼梯间,每( )层内可开启的外窗总面积之和不应小于( )m2。 A.3,2
B.5,3
C.5,2
D.3,3
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