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????????????????????????????????????????????????λ????? kg ???????????????W ???????? kg ?? = F ??????? mm2 ???? L ??????? m ??????????? g/cm3 ???? 1/1000????????? 7.85g/cm3 ??壨kg/m2??W= 7.85 ??d d= ?? ??? 4mm ???壬???m2 ???????m2 ????=7.85 ??4=31.4kg ??????????? ???????? ??????????????????

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