题目内容

用EXTRUDE命令拉伸要生成实体时,必须先建立一个二维图形,该二维图形必须是

A. LINE绘制的封闭图形，并且做面域操作
B. PLINE绘制的封闭图形,但自我相交
C. 圆
D. 圆弧

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