某污水管段采用D500mm钢筋混凝土管(n=0.014)，管底坡度为0.002，水力半径为0.12m，则该污水管内污水流速v为下列哪项？()
A.v=1.08m/s B.v=1.26m/s C.v=0.7m/s D.v=0.78m/s正确答案D
某污水管段采用D500mm钢筋混凝土管(n=0.014)，管底坡度为0.002，水力半径为0.12m，则该污水管内污水流速v为下列哪项？()
A.v=1.08m/s B.v=1.26m/s C.v=0.7m/s D.v=0.78m/s正确答案D
