The calculation of variable conversion cost is an important part of production planning optimization in the petrochemical industry.
可变加工成本的计算是石化企业生产计划优化中的重要组成部分，与企业利润直接相关。
The type-conversion cost of the resource-type cities can be divided into the adjustment cost and the delay cost.
资源型城市转型成本可以分为调整成本和延误成本。
The type-conversion cost of the resource-type cities can be divided into the adjustment cost and the delay cost.
资源型城市转型成本可以分为调整成本和延误成本。
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