城市土地资源具有明显的资产特性，属于经济资源，需要从经济学的角度来研究其最优利用。
Urban land resources, with obvious assets characteristic, is an economic resources, we should research the optimality use of urban land from the Angle of economics.
分析研究了冶金产业链的技术经济优化问题，建立了矿产资源最优利用的数学模型。
In this paper, the optimization of metallurgical industry chain is studied based on technique and economy, and a mathematical model for the optimum utilization of mineral resources is established.
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