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[单选题]
楼梯栏杆扶手的高度一般为900mm,供儿童使用的楼梯应在不小于()高度增设扶手。
A.400mm
B.700mm
C.600mm
D.500mm
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A.400mm
B.700mm
C.600mm
D.500mm
A.1000mm,400mm
B.1000mm, 500~600mm
C.900mm, 500~600mm
D.900mm, 400mm
A.1000mm,400mm
B.900mm,500~700mm
C.900mm,500~600mm
D.900mm,400mm
A.1100mm , 400mm
B.900mm,700 ~ 800mm
C.900 ~1000 mm,500 ~ 600mm
D.1200mm,500mm
A.住宅楼梯栏杆的扶手高度应不小于0.9m,当楼梯水平段长度大于0.7m时,其水平扶手高度不小于1.10m
B.幼儿园阳台、屋顶平台栏杆扶手高度应不小于1.05m
C.养老院阳台栏杆扶手高度应不小于1.05m
D.中小学校室外楼梯栏杆扶手高度不应低于1.10m