说明：  Laplace 方程数值解，要是研究小波基函数在自然边界元方法中的应用.目的是解决自然边界元方法中存在的奇异积分的困难,减小计算量,提高计算精度。
(Numerical solution of Laplace equation, if the study wavelet function used in natural boundary element method. Singular purpose is to solve the difficulties of integrating natural boundary element method exists to reduce calculation and improve accuracy.)