This paper chiefly studies the application of VRML (virtual reality modeling language) in the virtual model base of engineering graphics.
主要研究VRML（虚拟现实建模语言）在工程图学虚拟模型库中的应用。
Thirdly, on the base of "virtual distance attenuation", the paper brings forward a forecasting model of the CS of tourism websites—virtual distance weighing.
第三部分，首先根据旅游网站使用者满意度的“虚拟距离衰减”规律，引深提出了旅游网站使用者满意度的预测模式——“虚拟距离衡量法”。
Based on logical knowledge express model, virtual workshop scheduling system knowledge base are established, and knowledge for scheduling are expressed in rule form.
由逻辑型的知识表示模式构造虚拟车问调度系统知识库，知识库内存放的知识以规则的形式表示。
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