中国东北兴安岭地区年冻融频次的分布规律
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Distribution law of annual freeze-thaw frequency in Xing’anling region of Northeast China
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图2. 兴安岭地区冻土分布[ |
Fig. 2. Distribution of seasonally frozen soil, island permafrost and discontinuous permafrost in Xing’anling region[ |
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