基于DEA交叉模型的西北干旱地区城市效率评价——以甘肃河西地区为例
기우DEA교차모형적서북간한지구성시효솔평개——이감숙하서지구위례
Temporal and spatial changes of eco-e?ciency in northwest China based on DEA cross-evaluation models:taking the Hexi corridor of Gansu province as an example
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