自适应网格有限元计算方法，用来求解线性偏微分方程-Adaptive mesh finite element method for solving linear partial differential equations

有限单元法求解一阶偏微分方程，使用的方法是加权余量法，方法快捷准确-Finite element method to solve the first-order partial differential equations, a method using a weighted residual method, fast and accurate method