右图是北半球某段河流河道形态和断面图虚线表示河流主航道中心线据此完成31 32题 31.图中河道主要外力作用是 A.溯源侵蚀 b.下侵 Template




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tomski右图是北半球某段河流河道形态和断面图虚线表示河流主航道中心线据此完成31 32题 31.图中河道主要外力作用是 coloring