[单选题]室外楼梯建筑面积计算,( )。

A、有永久性顶盖的按自然层投影面积之和计算。
B、有永久性顶盖的按自然层投影面积的二分之一计算。
C、无永久性顶盖的按自然层投影面积的二分之一计算。
D、不应计算。

参考答案： B

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