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楼梯栏杆扶手的高度一般为____，供儿童使用的楼梯应在_高度增设扶手

A、1000mm，400mm

B、900mm, 500～600mm

C、900mm, 500～600mm

D、.900mm, 400mm

时间：2021-09-06 21:24 关键词：联大安阳师范学院建筑工程技术房屋建筑学

答案解析

B

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