四棱锥的投影，有两面投影外轮廓一定是三角形（）。There are two side views having triangles for the projection of a square pyramid.
举一反三
- 中国大学MOOC: 四棱锥的投影，有两面投影外轮廓一定是三角形（）。There are two side views having triangles for the projection of a square pyramid.
- 四棱锥的投影，有两面投影外轮廓一定是三角形（）。There are two side views having triangles for the projection of a square pyramid. A: 正确 B: 错误
- 四棱锥的投影，有两面投影外轮廓一定是三角形（）。
- 四棱锥的投影，有两面投影外轮廓一定是三角形（）。 A: 正确 B: 错误
- 两个视图为三角形，一面视图是圆的基本体是什么图形？What is the shape of the object two views that are both triangles and one view is a circle frame? A: 圆台 frustum of a cone B: 圆柱 cylinder C: 圆锥cone D: 四棱锥frustum of a pyramid