谢谢,你说的对。若按sketch in place而非sketch on workplane,选part上的面(或part坐标系的xy等面)画线就不会出现此问题。 / I- i. T: h. i9 `8 O; A帮助提示:If you pick a point or vertex on the same part, a blue focus point is projected to the workplane. (If, however, you pick points or vertices from different parts, a yellow focus point is projected onto the workplane and relationships are not maintained.)