Through a calculation for Xiangguosi gas field, it is shown that this increase curve is of great useful value in practice.

相国寺气田的计算实例表明这种增长曲线实际应用的重大价值。

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In this paper, the theoretical and technical bases of NURBS curve and surface are mainly discussed. Its engineering application and practice in the field of CAD are also researched.

本文论述了自由曲面(NURBS曲线和曲面)的理论和技术基础，并对其在CAD领域的工程实际应用进行了研究和探索。

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Practice shows that it is necessary to perform a comparison of adjacent well gas logging curve.

实践证明，在现场进行邻井气测曲线对比是十分必要的。

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But the United States, which is the largest provider, "is lagging a little bit behind the curve of good practice in food aid."

VOA: standard.2010.04.29