Gray-model-in-water

代码说明：

  灰色模型在城市中长期用水量预测中的应用，近年来, 随着我国经济的飞速发展, 城市规模 不断扩张, 现有供水系统已经不能满足未来几年 的供水需求, 必须依照未来城市发展与城市布局 进行科学合理的供水系统规划. 在(Gray model in the application of long-term water demand in recent years, as China' s rapid economic development, urban-scale expansion, the existing water supply system can not meet the water needs of the next few years must be in accordance with future urban development and urban scientific and rational layout of the water supply system planning. In)