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”。
Base on the practical data, the virtual structure, which has equivalent stiffness, is built by using inverse problem method. It can substitute the complex structure model in practice.
以实测数据为依据，采用反问题解法构造了与实际结构刚度相当的虚拟结构模型，代替了复杂的实际结构模型。
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