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????????????551800C??q420qe?????????????????

?????????2015/4/7

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??????????????? ????????????????????????????????????????????????????????????????????????????????????????????????????????;????????????????????????????????????????????????????? ??????????????5??1800??8000 32?? 8??1800??8000 90?? 8??2000??8000 70?? 8??2000??8000 32?? 10??1800??8000??

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5??1800??8000 32??
8??1800??8000 90??
8??2000??8000 70??
8??2000??8000 32??
10??1800??8000 70??

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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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