• 2021-04-14
    如图,一变直径管段AB,直径dA=0.2m,dB=0.4m,高差Δh=1.5m。今测得pA=30kN/m2,pB=40kN/m2,B处断面平均流速vB=1.5m/s,可以判断出水在管中的流动方向是从A到B。http://image.zhihuishu.com/zhs/onlineexam/ueditor/201901/9e25fad7864d43458fa142acd181b398.png