1·The difficulty in decomposing rational function into partial fraction is to fix the undetermined coefficient in partial fraction.
将有理函数分解为部分分式的难点就是确定部分分式中的待定系数。
2·By using the undetermined coefficient method, a new scheme is derived from the HAUC2 scheme to simulate the two dimensional convection-diffusion equation.
运用待定系数法，建立了求解二维对流扩散方程的HAUC2格式。
3·The undetermined coefficient of the model is selected by using the orthogonal optimum seeking method, thereby the quantitative relation of the model is determined.
用正交优选方法优选模型中的待求系数，确定了模型的定量关系。
4·In general, special solution of non-homogeneous linear equation of constant coefficient of the second order is obtained by the method of undetermined coefficient, but it's process is too complicated.
二阶常系数非齐次线性微分方程的特解一般都是用“待定系数”法求得的，但求解过程都比较繁琐。
5·The oxygen transfer theory can't be used to predict the reaeration coefficient of the rivers due to some undetermined parameters.
氧传质理论因存在不确定的参数而不能用来预测河流复氧系数。
6·The oxygen transfer theory cannot be used to predict the reaeration coefficient in rivers due to some undetermined parameters.
氧传输理论因存在不确定的参数而不能用来预测河流复氧系数。