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。
Open your exported file into any editor and check if is there any special character or any line breakers are there? Sometimes special characters stops the import process.
打开导出文件到任何编辑器，并检查是否有任何特殊字符或线路断路器？有时特殊字符停止导入过程。
Because the special production process and technical character of hydropower plants, there are so many unsafe factors and occupation harm factors in operation management process.
水力发电企业因其独有的生产流程和技术特点，运行管理过程中存在着许多不安全因素和职业危害因素。
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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