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所谓孔组是指相互之间具有相关功能作用的两个或多个孔所组成的一个整体。通常是以一个零件中的一组孔与另一个零件相对应的一
The so-called hole group refers to the mutual function between the two or more holes formed by a whole. It is usually one set of holes in one part that corresponds to another part