20 24 .40 38 8- 3 5 12 一般加工公差 <6 0.06 6-<18 0.09 18-<50 0.12 50-<120 0.18 120-<250 0.25 畫法 m Z a 0.
12.5.2020 https://itsm.cei-hk.com/redmine/attachments/download/11315/236682.png 236682.