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8??12?????6.01.56???·?????÷??????????????

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8??12?????6.01.56???·?????÷??????????????

??·???????????????????????????????????????????????????????????λ????? kg ???????????????W ???????? kg ?? = F ??????? mm2 ???? L ??????? m ??????????? g/cm3 ???? 1/1000????????? 7.85g/cm3 <BR>??壨kg/m2??W= 7.85 ??d d= ?? ??? 4mm ???壬???m2 ???????m2 ????=7.85 ??4=31.4kg<br><br>???????????????????????????ɡ?

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?????????????????????λ????? kg ???????????????

W ???????? kg ?? = F ??????? mm2 ???? L ??????? m ??????????? g/cm3 ???? 1/1000

????????? 7.85g/cm3
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??? 4mm ???壬???m2 ???????m2 ????=7.85 ??4=31.4kg

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