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【单选题】
下列说法哪个是错误的?A.
组成纵断面的坡段的特征用坡段长度和坡度值表示；
B.
坡段长度为坡段两端变坡点间的水平距离 ；
C.
坡度值为该坡段两端变坡点的高差与坡段长度的比值，以千分数表示；
D.
以上都不对。
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