Most object-oriented programming systems provide polymorphism through inheritance. 大部分面向对象的编程系统都通过继承提供多态性。
It is necessary to develop the numerical control WEDM programming system that face middle and small enterprises and has independent copyright. 因此研究和开发一个面向中小企业的具有自主版权的线切割编程系统是很有现实意义的。
