In the object-oriented finite element program, utilizing the inheritance and polymorphism may establish the object family that has the same key features, and can achieve the reuse of the code.
在面向对象的有限元程序设计中利用类的继承机制和多态性，可以建立具有共同关键特征的对象家族，实现代码的重用；
The object-oriented finite element program is studied. The object-oriented technique is applied to the multi-level optimization design to develop out the multi-level optimization design program.
本文开展了面向对象的有限元程序的研究，将面向对象应用于结构的多级优化设计中，开发出多级优化设计程序；
The object-oriented finite element program is studied. The object-oriented technique is applied to the multi-level optimization design to develop out the multi-level optimization design program.
本文开展了面向对象的有限元程序的研究，将面向对象应用于结构的多级优化设计中，开发出多级优化设计程序；
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