You can create a 3D model within Photopia's CAD system and then analyze the model.

用户可以运用本软件内置的CAD系统来建立3D模型并加以分析。

The best uniform approximation algorithm to approach the catenary suspension and the CAD system using this algorithm to design the catenarian dome of hot blast stove are described in the paper.

介绍了采用最佳一致逼近法对悬链线进行逼近,以及运用此算法进行热风炉悬链线拱顶设计的CAD）系统。