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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???????????
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D???D??????d??????????????12mm?m??0.012m
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??-5.00/-1.00180?-5.00D...
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