<p>如图所示等径有压圆管断面1的压强水头p1/γ=20mH2O，两断面中心点高差H=1m，断面1-2的水头损失<img alt="" src="https://file.gaojiufeng.cn/learnAppQuestion/32/a6/32a6516f22e93b138696fbb720071619.jpg" style="width: 100%;height: auto;">=3mH2O，则断面1的压强水头p2/γ为: <img alt="" src="https://file.gaojiufeng.cn/learnAppQuestion/d6/2a/d62a8de103fe82283cb4793bdddb3602.jpg" style="width: 100%;height: auto;"></p>