Double-stack container trains are the new railway products which can increase transport capacity with higher speed and lower unit operating cost.
铁路双层集装箱运输是一种运输速度快、运输费用省、单位运营成本低、能使运能提高的铁路货运新产品。
On the basis of Social Economic Engine Model (SEEM), this paper proposes the utility function of economic unit regarding to the speed of economic increase and surplus first.
在社会经济发动机模型（SEEM）的基础上，提出了经济主体对于经济增长速度和经济剩余的效用函数；
On the basis of Social Economic Engine Model (SEEM), this paper proposes the utility function of economic unit regarding to the speed of economic increase and surplus first.
在社会经济发动机模型（SEEM）的基础上，提出了经济主体对于经济增长速度和经济剩余的效用函数；
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