汇水管如图6-11所示，1～3部分水管的横截面积分别为A1=O.01m2，A2=0.005m2，A3=0.01m2，入流速度ν1=4m/s，ν2=6m/s，出流速度ν3为（）。

[单选题]汇流水管如图所示，已知三部分水管的横截面积分别为A1=0.01m2，A2=0.005m2，A3=0.01m2，人流速度v1=4m/s，v2=6m/s，求出流的流速v3为：（）A . 8m/sB . 6m/sC . 7m/sD . 5m/s

[单选题]（2012）汇流水管如图所示，已知三部分水管的横截面积分别为A1=0.01m2，A2=0.005m2，A3=0.01m2，人流速度v1=4m/s，v2=6m/s，求出流的流速v3为：（）A . 8m/sB . 6m/sC . 7m/sD . 5m/s

[单选题]汇流水管如图6-2-1所示，已知三部分水管的横截面积分别为A1=0.01m3,A2=0.005m2,A3=0.01m2,入流速度v1=4m/s,v2=

[单选题]汇流水管如图6-2-1所示，已知三部分水管的横截面积分别为A1=0.01m3,A2=0.005m2,A3=0.01m2,入流速度v1=4m/s,v2=

[单选题]汇流水管如图6-2-1所示，已知三部分水管的横截面积分别为A1=0.01m3,A2=0.005m2,A3=0.01m2,入流速度v1=4m/s,v2=

[单选题]汇流水管如图6-2-1所示，已知三部分水管的横截面积分别为A1=0.01m3,A2=0.005m2,A3=0.01m2,入流速度v1=4m/s,v2=

[单选题]汇流水管如图6-2-1所示，已知三部分水管的横截面积分别为A1=0.01m3,A2=0.005m2,A3=0.01m2,入流速度v1=4m/s,v2=

[单选题]汇流水管如图6-2-1所示，已知三部分水管的横截面积分别为A1=0.01m3,A2=0.005m2,A3=0.01m2,入流速度v1=4m/s,v2=

[单选题]汇流水管如图6-2-1所示，已知三部分水管的横截面积分别为A1=0.01m3,A2=0.005m2,A3=0.01m2,入流速度v1=4m/s,v2=

[单选题]汇流水管如图6-2-1所示，已知三部分水管的横截面积分别为A1=0.01m3,A2=0.005m2,A3=0.01m2,入流速度v1=4m/s,v2=