曲线是几何研究的主要对象之一,其主要原因在于:曲线的概念发生于人类的实线活动,关联着图形的绘制;地区界限的确定;运动物体轨迹的研究.曲线的概念从实践中发生,并且在自然界和生产过程中诸现象的数学描述中有广泛的应用.自古迄今,数学家们都注意着曲线概念,其原因就在于此(?)科学家们曾力求精密地定义:作为数学概念而言,曲线是什么?那就是要阐明:在实践中称之为曲线的那些事物里,什么为它们所共有. Curves are one of the main objects of geometric research. The main reasons are: the concept of curves occurs in the human solid line activity, is associated with the drawing of figures; the determination of regional boundaries; the study of the trajectories of moving objects. The concept of curves takes place from practice. , And has been widely used in the mathematical description of phenomena in nature and production. Since ancient times, mathematicians have paid attention to the concept of curves. The reason is that (?) Scientists have sought to define precisely: As a mathematical concept In terms of the curve, what is it? It is to clarify what is common to them in the things that are called curves in practice.