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【单选题】
现浇混凝土楼梯按水平投影面积计算时,不扣除下列哪项内容?( )A.
宽度<500mm的楼梯井< /div>
B.
宽度≤500mm的楼梯井
C.
宽度<300mm的楼梯井< /div>
D.
宽度≤300mm的楼梯井
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