On the basis of the explanation of the notion of pragmatic competence and review of its previous teaching , this paper con-cludes that instructions can improve
证明了一个比较原理,使得方程x=φ(y),y=-f(x)φ(y)-g(x)的周期解存在性定理可以用来判断系统x=φ(y),y=-h(x,y)φ(y)-g(x)的周期解的存在性.
A comparison principle is proved that the existence theorem of periodic so
As globalization is developed, the economy of China gets promoted and the pace of reform and opening up is accelerated, international exchanges of China become