题目内容
The snowline is a momentary line delimiting an area or altitude with complete snow cover in summer. It is also called firn line.
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Glacier is a large mass of ice formed, at least in part, on land by the compaction and recrystallization of snow, moving slowly by creep down slope or outward in all directions due to the stress of its own weight, and surviving from year to year.
The differences between desert and steppe climatic types are primarily a matter of degree.
头孢结构中易被破坏的部位是( )
用于用于口舌溃疡（ ）
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