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当前学科：（二）建筑防火检查
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当采用自然排烟时，高层建筑防烟楼梯间前室、消防电梯间前室可开启外窗面积不应小于()平方米。
A . A、2.00
B . B、3.00
C . C、4.00
D . D、5.00
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