角度测量是几何量计量技术的重要组成部分。
Angle measurement is an important part of geometric metrology.
传统几何量计量中一般以空间量作为基准量，被测量与基准量之间是空间对空间的关系。
In traditional methods geometrical quantity is measured by using spatial reference quantity, and the relationship between measured quantity and reference quantity is space-to-space.
对具有复杂、不规则轮廓的零件进行精密测量和误差评定，是当前几何量计量领域中的一个重要课题。
In the field of geometrical metrology, one of the important projects is the accurate measurement and error evaluation of parts profile with complicated and irregular surface.
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