通过对钻探成本构成的分类，推导出钻探成本公式。
The drilling cost formula is deduced from classification drilling cost components; hence, an approach to reduce drilling cost is presented.
建立包含一个备件配送中心和几个相同4s店的横向补货模型，得到横向补货的库存成本公式和服务水平公式。
To establish a parts distribution center and some same horizontal 4s shop replenishment models, and it gets a inventory cost formula of horizontal replenishment and a formula of service level.
例如，如果一个生产产生了了200个单位，那么总成本可以通过应用下面公式200次得到(从1到200)然后把这200个数值相加。
For example, If a production run has generated 200 units, the total cost can be derived by taking the equation below and applying it 200 times (for units 1 to 200) and then summing the 200 values.
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