1.流域是一个相对独立的自然地理系统它以水系为纽带将系统内各自然地理要素连结成 个不可分割的整体.随着人类活动的加剧流域已成为区域人地 Template




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tomski1.流域是一个相对独立的自然地理系统它以水系为纽带将系统内各自然地理要素连结成 个不可分割的整体.随着人类活动的加剧流域已成为区域人地 coloring