GB131-83 "Mechanical drawing surface roughness code and its method" has been published for many years, this is a very rigorous and very clear standard documents. The standard adopts the international standard unified labeling method and directly labels the parameter values ​​to indicate the requirements after completion. However, in the design drawings that we usually touch, there are still some improper use or some customary annotations, but can not accurately express the designer's ideas, and some also cause waste.
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