A study is made of the evolution of the input quantity and structure of the fertilizer potassium resource on farmland in Henan Province.
对河南省农田肥料钾资源投入数量和结构的演变状况进行了研究。
The equations of mass conservations of the reactions arc described by a nonlinear parabolic system of equations. The objective function is the input quantity of gas in a fixed period of time.
反应的质量守恒方程为非线性抛物方程组，目标函数为一定时间内输入的气体量。
The equations of mass conservations of the reactions arc described by a nonlinear parabolic system of equations. The objective function is the input quantity of gas in a fixed period of time.
反应的质量守恒方程为非线性抛物方程组，目标函数为一定时间内输入的气体量。
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