区别：倾斜度公差——面轮廓度 （Angularity Does Not Locate - Use Profile of a

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中英文对照

倾斜度公差没有给出位置要求——优先选用面轮廓度

http://www.dimcax.com/gdt_web/february-07.htm

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Another Angularity Does Not Locate Tip
在图纸上给出公差要求，最重要的是要控制特征的位置。若只给出倾斜度等定向公差要求（倾斜度公差没有给出是平行于还是垂直于基准的要求），这样的公差是不完整的。垂直度，平行度和倾斜度这三种定向公差都不能控制特征的位置，我们可以采用给出基准要求的面轮廓度来控制特征的位置。例如，对于如图所示的零件的斜面来说，需要控制相对于基准的位置，若仅仅给出倾斜度的定向要求，图纸上给出的公差要求是不完整的，可选择给出面轮廓度的公差要求。面轮廓度不仅能控制斜面的位置，而且能控制面的倾斜度。若还需要比面轮廓度的方向控制得更好些，可以再给出倾斜度公差要求。须牢记一点的是，位置是首先考虑的因素，其次才考虑refine。

A common error on drawings is to apply only angularity to features that are not perpendicular or parallel to the datum reference frame. The most important characteristic to control is location. Position locates features of size. Profile of a surface is the only geometric tolerance that locates surfaces. The orientation tolerances of perpendicularity, parallelism and angularity never locate features. The angled surfaces on this part, for instance, need to be located relative to the datum reference frame. If only angularity had been applied, the drawing would be incomplete. Profile of a surface locates the surfaces in addition to controlling the angularity. If the orientation of these surfaces needs to be better than the orientation provided by the profile of a surface tolerance, an angularity tolerance may be added as a refinement. Locate first-refine second.

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英文讲解动画视频参见
http://www.dimcax.com/gdt_web/february-07_files/Feb_07-rev.wmv
英文讲解内容见上原帖内容。