本文应用理论计算法，推导出输油（气）管道功能成本方程，并根据工程实际，绘制出了功能成本曲线图。
The theoretical calculation method is applied to pipelines in this paper The function-cost equation in oil and natural gas pipelines is deduced. According to practice, the curves of F-C are drawn.
Big - o notation：计算复杂性理论使用大0符号描述输入数据大小如何影响计算资源对算法的使用。
Big-O notation: computational complexity theory USES big-O notation to describe how input-data size affects an algorithm's use of computational resources.
理论证明和数值计算结果表明，该算法是有效的。
The theory proof and numerical computing results show that the method is valid.
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