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。
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。
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