风管计算计算时，请输入不同规格的管长即可。规格200200面积和规格250250250面积和规格320320320320面积和规格400400400400400面积和规格500500500500500500面积和规格630630630630630630630面积和200250320400500630200250320400500200250320400200250320200250200周长mm800周长mm9001000周长mm104011401280周长mm1200130014401600周长mm140015001018002000周长mm166017601900206022602520管长m555555管长m55555管长m5555管长m555管长m55管长m5面积m34.559.5面积m35.25.76.417.3面积m366.57.2827.7面积m377.58.291041.7面积m38.38..510.311.312.660.8面积m344规格800800800800800800800800面积和规格100010001000100010001000100010001000面积和规格1250``125012501250125012501250125012501250面积和规格面积总和250320400500630800100012502002503204005006308001000200250320400500630800周长mm2000210022402400260028603200周长mm240025002028003000326036004000周长mm#VALUE!30003140330035003760410045005000抛后规格面积总和（百分比2%）管长m5555555管长m55555555管长m面积m31010.511.2121314.31687面积m31212.513.2141516.31820121面积m35#VALUE!515515.7516.5517.5518.8520.5522.5525#VALUE!#VALUE!2%）#VALUE!
