Outline of reading 读图要点 1.Understanding the meaning of individual lines and other drawing elements of the view.要读懂视图中图线、线框的含义。 (1)Lines and curves (including circular arcs)represent the following: 视图上图线有直线、曲线（包括圆弧），它们表示： 1)The projection of accumulation planes. 具有积聚性表面的投影。 2)The projection of intersection of two planes. 两表面交线的投影。 3)The projection of the outline of cylindrical surfaces. 曲面轮廓线的投影。 (2)Each closed loop of lines/curves represents: 视图上每一封闭线框可表示： 1)The projection of a plane. 平面的投影。 2)The projection of a curved surface. 曲面的投影。 3)The projection of a curved surface and its tangent plane. 曲面与其切平面的投影。 请点击鼠标左键显示后面内容 2 Outline of reading 读图要点 1. Understanding the meaning of individual lines and other drawing elements of the view. 要读懂视图中图线、线框的含义。 (2) Each closed loop of lines/curves represents: 视图上每一封闭线框可表示: 请点击鼠标左键显示后面内容 (1) Lines and curves (including circular arcs) represent the following: 视图上图线有直线、曲线(包括圆弧)，它们表示: B 1) The projection of accumulation planes. 具有积聚性表面的投影。 2) The projection of intersection of two planes. 两表面交线的投影。 3) The projection of the outline of cylindrical surfaces. 曲面轮廓线的投影。 A C 1) The projection of a plane. 平面的投影。 2) The projection of a curved surface. 曲面的投影。 3) The projection of a curved surface and its tangent plane. 曲面与其切平面的投影。 I Ⅱ Ⅲ