【单选题】【消耗次数：1】
在地形图中，主要用等高线来表示地面的起伏形态。等高线有（ ）、间曲线和助曲线。
①
基本等高线
②
竖曲线
③
平曲线
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【多选题】
等高线的特点有（）
①
A同一等高线上，各点的高程相等
②
B同一幅等高线图上，等高距相等
③
C等高线数值大，海拔高；等高线数值小、海拔低
④
D等高线越密集、坡度陡；等高线越稀疏、坡度缓
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could
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