单项选择题

根据《建设工程工程量清单计价规范》(GB 50500—2008)，现浇混凝土楼梯的工程量应（）。 A．按设计图示尺寸以体积计算 B．按设计图示尺寸以水平投影面积计算 C．扣除宽度不小于300 mm的楼梯井 D．包含伸入墙内部分

A.按设计图示尺寸以体积计算
B.按设计图示尺寸以水平投影面积计算
C.扣除宽度不小于300
D.包含伸入墙内部分

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