We researched the characteristics of the OOP language. In view of the characteristics of GUI application programming, definitions of widget structure and widget class have been abstracted.

对面向对象编程语言的特性进行了一定的研究，针对GUI应用编程的特点，抽象出了组件结构和组件类的定义。

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For the multivariable and nonlinear characteristics of ball mill system, analyzed the characteristics of objects, and designed fuzzy controller, which is realized on PLC using st programming language.

针对球磨机系统的多变量及非线性等特点，本文对球磨机系统进行对象特性分析，进行了模糊控制器的设计，并在PL C上采用结构化文本语言编程实现。

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The article introduces a new language VRML which is the core technology of the second generation WWW, and discusses its characteristics, programming, application and perspective.

本文介绍了第二代WWW技术核心VRML 语言及其特点、文件创建方法、应用和发展前景。

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