1．在一管路上测得过流断面1-1的测压管高度为1.5m，过流面积A1为0.05m2；过流断面2-2的面积A2为0.02m2；两断面间水头损失为；管中流量Q为20l/s；z1为2.5m，z2为1.6m。试求断面2-2的测压管高度。（提示：注意流动方向）。 - 查题网

>> 国家开放大学 / 流体力学

国家开放大学 / 流体力学

1．在一管路上测得过流断面1-1的测压管高度为1.5m，过流面积A₁为0.05m²；过流断面2-2的面积A₂为0.02m²；两断面间水头损失为；管中流量Q为20l/s；z₁为2.5m，z₂为1.6m。试求断面2-2的测压管高度。（提示：注意流动方向）。

积分

流体力学

参考答案：

点击查看答案

佳题速递：

5．A、B的往测为210.41m，返测为210.35m ，其相对误差为建筑测量

练习法的种类包括：（）。 a.变化练习法b.重复练习法c.分解练习法d.完整练习法学前儿童健康教育

50、下面说法正确的是_______。 A.系统更新包括Offece软件的升级 B.系统更新包括防病毒软件的升级 C.系统更新包括数据库管理系统的升级 D.系统更新包括安全软件的更新计算机统考

瑞文标准推理测验属于（）(A) 学习测验 (B) 智力测验 (C) 人格测验 (D) 心理健康综合测验小学生心理辅导

7、From Monday to Friday most people are busy working or studying, but in the evenings and weekends they are free and _ _ 21 _ _ themselves. Some watch television or go to the movies, others take part in sports. This is decided by their own interests. There are many different ways to spend our free time. Almost everyone has some kind of _ _ 22 _ _ . It may be something from colleting stamps to making model planes. Some hobbies are very expensive, but others don't cost anything at all. Some collections are worth a lot of money, others are valuable only to their owners. I know a man who has a coin collection worth several _ _ 23 _ _ dollars. A short time ago he bought a rare fifty-cent piece which cost him ＄250! He was very happy about this collection and thought the price was all right. On the other hand, my youngest brother collects match boxes. He has almost 600 kinds of them, but I wonder _ _ 24 _ _ they are worth any money. However, to my brother they are quite valuable. _ _ 25 _ _ makes him happier than to find a new match box for his collection. That's what a hobby means, I think. It is something we like to do in our free time just for the fun of it. The value in dollars is not important, but the pleasure it gives us is.统考英语完型填空

128、在计算机中用______表示汉字。 A.ASCII码 B.BCD码 C.汉字编码 D.字符编码计算机统考