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【单选题】
在等高线地形图上 ①同一等高线表示的高度各点相等 ②等高线向海拔高处凸出时则为山脊 ③等高线向海拔低处凸出时则为山谷 ④等高线的疏密状况不同，表示的地形起伏状况不同 [     ]
A.
①④
B.
①②
C.
②③
D.
③④
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