如图6-14所示垂直下泄恒定流水管，出口流速ν=6m/s，管径不变，上游断面1-1高于出口断面2-2，高差为4m，水头损失不计，则上断面1-1的压强水头为（）mH2O。

[单选题,案例分析题] 某正方形基础尺寸为6m×6m，如图3.7.2.4所示，混凝土轴心抗拉强度设计值为fT=1.1N／mm2基础顶面受到相应于荷载效应基本组合时的竖向力F=3800kN，正方形截面柱尺寸为1.6m×1.6m，基础埋深2m。

[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=

[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=