??????????????
????????(??+??+8)/100 x(??+??+6)/100 x ????(?/CM2)
?????кУ?{(??+??)*2+4}/100x{(??+??)*2)}/100* ????(?/CM2)
????????(??+??+7)/100 x(??+??+3)/100 x ????(?/CM2)
????????(??+??+7)/100 x(??+??+3)/100 x ????(?/CM2)
???????У????????λ?CM????????????????????
??????е???????
??????е???????( M2 ) X ???( 3.8 ~ 4 )????????????????4.8 ??
?????????????????????( ?? + ?? ) X 2 + 3 ??/100 X ??( ?? X 2 + ?? ) + 2 ??/100 ???г?????????CM??
??????????????????е???? 7 X 6 X 16 CM
???????????????( 7 + 6 ) X 2 + 3 ??/100 X ??( 6 X 2 + 16 ) + 2 ??/100 = 0.087 M2 ???д????? 0.087 X 4 = 0.35? ????ù???????????????С???С?
????????????е?????????????????????????????????????????????????????????????????????
??????????????????:???78.7 X 109 CM ?? ???89 X 119 CM .
??????м?????????????е?????????磬??????(????)???????????????????????????ó??????????????????????????????????????????????????á?
???????????г?????????????????????????????300~ 600????????? 150???
