阅读图文材料,完成下列要求。 多年冻土分为上下两层,上层为夏季融化,冬季冻结的活动层,下层为多年冻结层。�国的多年冻土分布主要分布于东北高纬度 Template




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tomski阅读图文材料,完成下列要求。 多年冻土分为上下两层,上层为夏季融化,冬季冻结的活动层,下层为多年冻结层。�国的多年冻土分布主要分布于东北高纬度 coloring