There are not only direct costs but also fixed and variable cost when calculating cost of production.
在产品成本中不仅仅包括直接费用， 而且还包括固定和变动间接费用。
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 multi-rate variable well testing can weaken wellbore storage, shorten test time and economize the cost of test, and the contradiction between test and production is also solved to some degree.
多级变流量试井可以减少井筒储存效应，缩短测试时间，节省成本，使试井与生产的矛盾在一定程度上得以缓解。
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