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问12:标准公差的作用是什么?最高与最低等级的代号各是什么? 答:标准公差是以表格形式列出的,用以确定公差带r大小。最高等级代号是IT01,最低等级代号是IT18。问13:基本偏差的作用是什么?孔、轴各有多少种基本偏差?各举五个孔、轴基本偏差的代号。
Q12: What is the role of standard tolerances? What are the highest and lowest level codes? A: The standard tolerances are listed in tabular form to determine the tolerance zone size. The highest level code is IT01, the lowest level code is IT18. Q13: What is the role of basic deviation? How many kinds of basic deviations are there in the hole and the shaft?