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【单选题】
对楼梯踏步的最小宽度和最大高度要求,错误的是( )。A.
住宅公共楼梯，踏步的最小宽度为260m m，最大高度为175m m
B.
住宅户内楼梯，踏步的最小宽度为220m m，最大高度为190m m
C.
幼儿园楼梯，踏步的最小宽度为260m m，最大高度为150m m
D.
商场公用楼梯，踏步的最小宽度为280m珊，最大高度为160m m
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