单项选择题
A.900~1000mm B.1000~1100mm C.1100~1200mm D.1200~1300mm
A.减小楼梯宽度 B.减小公共走廊宽度 C.跃层剖面的组合方式 D.降低层高
A.0.6mm B.1.2mm C.2.5mm D.5.0mm