单项选择题
A.≥梯段宽度 B.≥梯段水平投影长度 C.≤梯段宽度 D.≤梯段水平投影长度
A.900mm B.1100mm C.1200mm D.1400mm
A.[0.5+(0.1~0.2)]m B.[0.55+(0.1~0.2)]m C.[0.5+(0~0.15)]m D.[0.55+(0~0.15)]m
A.150~200mm B.120~180mm C.140~175mm D.160~220mm
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