单项选择题
A.换算坡度 B.实际坡度 C.平均坡度 D.最大坡度
A.1850mm B.2440mm C.1750mm D.2150mm
A.3200mm B.3400mm C.3600mm D.3800mm
A.6500mm B.5700mm C.6200mm D.5330mm
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