青海高原主要农业区50年初·终霜冻日变化特征及分布规律分析
청해고원주요농업구50년초·종상동일변화특정급분포규률분석
The First and Last Frost Daily Change Characteristics and Distribution Regularity Analysis of Main Agricultural Area on Qinghai-Tibetan Plateau during the Last 5 Decades
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