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		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8. 兴安岭地区多年平均冻融频次随经纬度及海拔的变化 | 
| Fig. 8. Variation of averaged annual freeze-thaw frequency in Xing’anling region with latitude (a), longitude (b) and altitude (c) | 
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