绘制三视图时 可见的轮廓用粗实线绘制 不可见的轮廓用虚线绘制。 One can represent the visible
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绘制三视图时,可见的轮廓用粗实线绘制,不可见的轮廓用虚线绘制。 One can represent the visible outline with thick line and invisible outline with dash line when making three views.

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