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1·With this method, shape points were calculated by surface outline equation got from quadratic surface.

该方法通过二次曲面求管线表面轮廓方程进而求得管线的型值点集。

2·From this paper, the equations of tangent planes of a quadratic surface are obtained by matrix operations.

本文应用矩阵的运算，给出求二次曲面的切平面方程的一个筒单方法。

3·The problem to determine the principal axis of quadratic surface is summed up to be that of finding the stop point of J-function.

并将确定二次有心曲面的主轴问题，归结为求J函数的逗留点问题。

4·In the paper, large deformation of symmetry fission has been described by a biquadratic surface revolution instead of several quadratic equations.

本文用四次方程代替常用的几个二次方程曲线的回转体，来描述对称裂交的大形变过程。

5·The main content: vector algebra, plane and linear space, special surfaces and secondary surfaces, general quadratic surfaces and general quadric surface.

主要内容有：向量代数、空间的平面和直线、特殊曲面和二次曲面、一般二次曲面和一般二次曲面。

6·As an important approach for improvement of productive efficiency and shape design, more and more attention is paid for reverse engineering, fitting of quadratic surface is one of its components.

作为提高生产效率和改善造型设计的重要途径，逆向工程受到越来越多的重视，空间二次曲面拟合是其重要组成部分之一。

7·Nowadays, general fitting methods are based on the character equations of quadratic surface to implement. For it is so complicated that a lot of fitting software exist a lot of restrict conditions.

目前的通用方法都是基于二次曲面的特征方程进行拟合，由于特征方程求解复杂，因此这些拟合软件在进行曲面拟合时均存在很多的限制条件。

8·Nonlinear regression and quadratic response surface models.

非线性回归和二次响应面模型。

9·The optimum design of plane quadratic enveloping ring surface worm drive has been realized using the theory and method of optimization.

针对平面二次包络环面蜗杆传动，运用优化理论和方法，对其进行了优化设计。

10·Auxiliary surface is commonly used as a graphic solution for the projections of the intersection line of quadratic cambers of revolution.

在两个二次回转曲面体相贯线的求解中，辅助面法是常用的图解方法。