【单选题】【消耗次数：1】
在AutoCAD中用Pline命令绘制的连续线与用Line命令绘制的连续线的不同点在于________。
①
Pline命令绘制的连续线是一个整体，而Line不是。
②
Pline命令绘制的连续线是不可用“U”取消上一段的，而Line可以
③
Pline命令绘制的连续线不能用C方式封闭，而Line可以。
④
Pline命令只能画连续线，不能只画一条直线段，而Line可以。
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