The view of symmetrical part can be drawn a half or quarter part, and two continuous thin lines paralleling to each other should be drawn on the two ends of the perpendicular center line, as shown in Fig.12.

 
  • 当机件上具有相同的结构要素(如孔、槽)并按一定规律分布时,只需要画出几个完整的结构,其余的可用细实线连接或画出他们的中心位置,并在图中注明其总数,如图12所示。
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