通过对国内外钻井成本研究的分析，寻找影响钻井作业成本的主要因素，可指导钻井作业成本预测模型的建立。
Through analysis on the study of drilling cost both at home and abroad, the main factors influencing the drilling cost have been found to guide to build up the forecast model on the drilling cost.
分析了影响原煤成本的主要因素，建立原煤成本预测模型，并应用某煤矿成本数据进行预测分析，取得了较好的预测结果。
The paper analyzed the main influence factors, established the raw coal cost forecast model, and carries on the forecast analysis using some coal mine cost data, and obtained the good forecast result.
这个模型对经销商的成本/收益的预测应为 $400 - (2.5% * $3) - (8.7% * 400) = $365。
This model from a cost/benefit perspective to the dealership would be $400 - (2.5% * $3) - (8.7% * 400) = $365.
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