棱锥三视图的图形特征是一个视图为多边形，两个视图外轮廓为（）

单项选择题What is the purpose of the International Conference on E-Business？A. To grow importance from increasing interest in the IT research community.B. To cover low-level technological issues.C. To cover different approaches to address these issues and different possible applications.D. To bring together researchers and practitioners who are interested in E-Business.

单项选择题棱台三视图的图形特征是一个视图为多边形，两个视图外轮廓为（）