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题目内容
(河南理工大学矿井通风与安全.)
梯形巷道摩擦阻力系数0.0177Ns2/m4,巷道长200m,净断面5m2,风量720m3/min,则摩擦风阻Ns2/m8和摩擦阻力Pa为()
A.0.2357,32.1
B.0.2634,37.9
C.0.3420,44.2
D.0.4567,50.4
A.0.2357,32.1
B.0.2634,37.9
C.0.3420,44.2
D.0.4567,50.4
参考答案