基于GM（1，1）的经典灰色预测拟合模型 是典型的非线性微分动态模型,适用于非单调摆动发展序列或饱和 S 形序列(A classical grey forecast fitting model based on GM (1, 1) It is a typical nonlinear differential dynamic model, which is applicable to the non monotonic oscillating development sequence or t