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road in permafrost region
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road in permafrost region
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〔特殊地区筑路〕
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road in permafrost region
多年冻土地区道路
在土温低于摄氏零度和具有地下冰的条件下,地下形成一层能持续多年保持冻结状态的土称多年冻土。
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oriented cobordism
oriented cobordism class
oriented cobordism group
oriented cobordism theory
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