Relative positions of composite solids 形体表面间的相对位置关系 3.Tangency相切 When two neighboring surfaces are in tangent condition,there is no line between their projection 当相邻表面间处于相切时， 在相切处不画线。 4.Intersection相交 When neighboring planes intersect,one should draw the projection of the intersection line. 当相邻表面间处于相交时， 在相交处应画出交线的投影。 Example 5 Example 6 Example 7 Example 8 Example 9 例5.组合体A 例6组合体B例7组合体C例8.组合体D 例9.组合体E 请点击鼠标左键显示后面内容4 请点击鼠标左键显示后面内容 3.Tangency 相切 4.Intersection 相交 When two neighboring surfaces are in tangent condition, there is no line between their projections. 当相邻表面间处于相切时， 在相切处不画线。 Relative positions of composite solids 形体表面间的相对位置关系 When neighboring planes intersect, one should draw the projection of the intersection line. 当相邻表面间处于相交时， 在相交处应画出交线的投影。 Example 5 Example 6 Example 7 Example 8 Example 9 例5.组合体A 例6.组合体B 例7.组合体C 例8.组合体D 例9.组合体E