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1·This paper discussed an elementary solution to the envelope of a kind of family of curves of which the equation was one of the cubic equations in regard to a parameter.

本文论述曲线族的方程为关于参数的三次方程时，其包络曲线方程的初等求法。

2·The normalized form of shear modulus vs. strain amplitude will be shown by a single curve, and that of damping ratio vs. strain amplitude by a family of curves or a band zone with shrunk ends.

经归一化后，前者在平面上表示为单一的一根曲线，后者则表现为一簇曲线或两端是尖灭、。

3·In this article, the unified profile expression of the planar CAM mechanism with translation or oscillation follower is established based on the theory of envelopes for 1 parameter family of curves.

将从动件的直线往复移动和定点往复摆动用虚拟摆动统一表示，采用单参数包络曲线理论建立直动和摆动从动件平面盘形凸轮轮廓的统一数学表达式。

4·The use of cubic spline interpolation function method can only solve the processing problem of nomographs consisting of one family curves.

指出用三次样条插值函数法只能解决由一组曲线族组成的图表处理问题。

5·According to the equation of asymptotic curves, a family of nonlinear asymptotic curves are given to the principal normal surface.

根据渐近曲线的方程，具体给出主法线曲面的一族非直线的渐近曲线。