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问题 问答题

薄壁孔口出流，直径d=2cm，水箱水位恒定为H=2m，试求：（1）孔口流量Q；（2）此孔口外接圆柱形管嘴的流量Qn；（3）管嘴收缩断面的真空。

答案

参考答案：

解答过程略 答案为：Q=1.22L/s；Qn=1.613L/s；hv=1.5m

改错题

短文改错（15分）

假定英语课上老师要求同桌之间交换修改作文，请你修改你同桌写得以下作文。文中共有10处错误，涉及一个单词的增加、删除或修改。

增加：在此处加一个漏字符号 ( ∧ )，并在其下面写出修改的词。

删除：把多余的词用斜线 ( ＼ ) 划掉。

修改：在错的词下划一横线，并在其下面写出修改后的词。

注意：1. 每处错误及其修改均仅限一词；

2. 只允许修改10处，多者（从十一处起）不计分。

My grandfather and I enjoy fishing.

One Sunday morning we go fishing at a lake. We took ours fishing poles and headed for the lake. As soon as we arrived, so we dropped the lines into the water. Before waiting for half an hour, I was beginning to get impatiently. I wanted to give up, and my grandfather told me to wait a little longer. Finally, there were a sudden pull at the pole and fish was caught. Within the next few minute, my grandfather also caught a fish.

Felt hungry, we built a fire by the lake and barbecued the fish. It was delicious.

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问答题 简答题

什么是简单的调节系统？
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