單項(xiàng)選擇題

圖示一矩形斷面通風(fēng)管道,斷面尺寸為1.2m×0.6m,空氣密度ρ=1.20kg/m3,流速v=16.2m/s,沿程阻力系數(shù)λ=0.0145,流程長(zhǎng)度L=12m的沿程壓強(qiáng)損失為()

A.31N/m2
B.28.14N/m2
C.34.25N/m2
D.45.51N/m2