This paper infers the parametric equation of the quadric B-spline curve, introduces its character, and gives the special method of process when the curve is approximated.
本文推导出计算机绘图中的二次B一样条曲线的参数方程，介绍二次B一样条曲线的性质，并给出在逼近曲线时的特殊处理方法。
In the production of cool rolling seamless steel pipe, its technology is complex, process is tedious and character is special, so the automatic control system of cool rolling mill is a complex system.
冷轧无缝钢管的生产工艺复杂、过程烦琐，具有独特的生产特点，因此冷轧机自动控制系统是一个复杂的系统。
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