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当直径d=400mm和长度Z=200m的供水管进行试验时，水流量QV=100m3／h，密度为1000 kg／m3，管道始端的压力表压力p1=0．9MPa，管道末端的压力表压力p2=0．35MPa，静止状态下(QV=0)，上述压力表的读数相应为p1=0．9MPa和p2=0．35MPa。若K=0．2mm，试求实际压力降比计算压力降大几倍，设总的局部阻力系数∑ζ=20。

A.9MPa，管道末端的压力表压力p2=0．35MPa，静止状态下(QV=0)，上述压力表的读数相应为p1=0．9MPa和p2=0．35MPa。若K=0．2mm，试求实际压力降比计算压力降大几倍，设总的局部阻力系数∑ζ=20。


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