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 with two
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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 with 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
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C