根据现有城市原生污水源热泵的技术经济特点，以系统的费用年值为目标函数，建立了系统综合优化的数学模型。
According to the characteristics of technology and economy of city untreated sewage source heat pump system, the mathematical models of annual cost object function are established.
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.
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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