用正交多项式做小二乘曲线拟合， 针对给定数据的煤自燃监测数据中煤温与 之间的非线性关系，用正交多项式做最小二乘曲线拟合。数值分析-Orthogonal polynomials with small squares curve fitting to do, for a given data monitoring data in the coal spontaneous combustion of coal and the nonlinear relationship between tempera