The parallel-connection and variable-speed operation characters of the centrifugal pump groups are studied by conics fitting of the character curves in the high efficiency area.

通过对离心式水泵高效工作区的性能曲线进行二次拟合，分析了离心式水泵机组并联调速运行特性。

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In local area, we can arrive at preferable precision by GPS height fitting using polyhedral function model.

高程异常一般呈多曲面分布，在局部区域内，建立多面函数模型进行GPS高程拟合，可以达到较高的精度。

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The contour line of human brain was simulated by the curve-fitting methods and then the inner area was discretized by advancing-front methods which was improved at last.

利用曲线拟合方法模拟大脑外形轮廓曲线，然后采用波前法完成曲线内部区域的离散化，并对波前法提出了改进措施。

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