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。
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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