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??????????4.00D?????4.00D??????????????????????????? ??D???
D=D/1-dD
D???D??????d??????????????12mm?m??0.012m
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1-6.00/-1.251807.8/8.0@180????-1.25D??-1.00D180??-0.25180???????????
2-6.00/-1.001807.8/7.85@180????-1.00D??0??-1.00D180???????
3-6.00D7.8/8.0@180????0??1.00D180??-1.00D180?????,????????????????
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??-5.00/-1.00180?-5.00D...

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