Also we can forecast the air spares demand by the order model, and use the air supply ratio land the capital ratio to evaluate the service quality of air supply system.
本文的特点在于利用数学方法来预测航材的需求，运用航材保障率和资金周转率来评价航材保障系统的服务质量。
Gray forecast model could be made good use of by reflecting changes in land use structure and the speed of trends in a stable land-use policy. It's easy to apply and based on data for less.
应用灰色模型预测土地利用结构变化，在稳定的土地利用政策下，预测结果基本能反映土地利用结构变化的速度与趋势，且计算较为简单，所需基础数据较少。
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