Based on the analysis of existing models, the problem of empty wagon distribution is abstractly described from varied studying viewpoint, TP model and EWDCO model are constructed.
在分析已有模型的基础上，从不同的研究角度，对空车调配问题进行抽象描述，建立了TP模型和EWDCO模型。
Based on the analysis of existing models, the problem of empty wagon distribution is abstractly described from varied studying viewpoint, TP model and EWDCO model are constructed.
在分析已有模型的基础上，从不同的研究角度，对空车调配问题进行抽象描述，建立了TP模型和EWDCO模型。
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