风量与风管和风速之间的计算

风量120000.2123144610.176929421100000.1769294210.14744384风量管径风速1200035034.7风量管径风速8200400.38818.10.160311风量管径风速8184.096400.00018.1已知管径、风速求风量已知风量、风速求管径20m/s24m/s已知风量、管径求风速已知风量、风速求管径