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 ?????г????????????????????????????????????????????????????????????????????????Щ??????????????????????????????????????????????顢NKK??????????????????????????,??????????????????????????????????????????Ρ???Ρ????????

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1?????????????1.95??105MPa???????????????????????????????
??1.96 19.3 19.1??/3=1.93??105MPa??
2?????????????????μ???????????????
??L=P*L*(1-e-(kx ???))/(kL ???)/Ay/Eg



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