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The length dimension is the most basic parameter to characterize the contour, shape and size of the part. It is divided into inner dimension, outer dimension, arc dimension and intersection dimension according to its structural features. The relevant size is a kind of intersection size, but it is different from the intersection size, has its own size characteristics, and is measured and calculated according to relevant regulations. First, the characteristics of the relevant dimensions Some of the mechanical parts are marked by a common point. This point may be on the part or outside the part, forming a space