??????????????????

?硡????0635??2189598

???????13396220692??17862525099??17862512888??18963580692

?????2418524989@qq.com

??????????????????

??????????????и??????????????66??

??????λ??? ?? ? >> ??????

????12??25????????630??q345qd????????屨???????????

?????????2013/12/25

???????????????????????

?????2779

????12??25????????630??q345qd????????屨???????????

??????????????????????????????????????????????????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>???????? ???????????й?????????????г??????

???????????????

?????????????????????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

????????

???????????й?????????????г???????????????????????????????и?????????????12?????160??????????????????????????????????????е?豸???????????????и????????????????8-600mm???4.6m??????15m???????и??????????????????????????????????к?????????????????????豸?????????????????????????????????