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本文提出了用三次样条函数插值计算天然气压缩系数图的方法，并利用计算机绘图技术选取了最佳插值样点。计算结果与原图吻合甚好，相对误差不超过０．３％。
In this paper, a method of calculating natural gas compression coefficient by interpolation of cubic spline function is proposed, and the best interpolation point is selected by computer graphics. The calculated results are in good agreement with the original figure, with a relative error not exceeding 0.3%.