The appropriate answer to this is to explain the difference between physical and non-physical objects.
适当的回答是解释之间的物质和非物质对象的区别。
The mathematical expression of this model is a second order non linear ordinary difference equation.
该模型的数学形式是一个非线性二阶常微分方程，利用有限差分方法进行求解。
The mathematical expression of this model is a second order non linear ordinary difference equation.
该模型的数学形式是一个非线性二阶常微分方程，利用有限差分方法进行求解。
应用推荐