问题
问答题 简答题
有闸门和无闸门的溢流坝各有哪些优缺点？
答案
参考答案：
不设闸门：泄洪时，库水位壅高，淹没损失加大，非溢流坝坝顶高程加高，结构简单，管理方便。
设闸门：闸门略高于正常蓄水位，堰顶高程较低，可调节水库水位和下泄流量，减少上游淹没损失和非溢流坝工程量。
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有闸门和无闸门的溢流坝各有哪些优缺点？
参考答案：
不设闸门：泄洪时，库水位壅高，淹没损失加大，非溢流坝坝顶高程加高，结构简单，管理方便。
设闸门：闸门略高于正常蓄水位，堰顶高程较低，可调节水库水位和下泄流量，减少上游淹没损失和非溢流坝工程量。
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| I work as a postal letter carrier in Charlotte. One day several years ago, I drove up to a 1 . Christy, the young divorcee (离了婚的人)who lived there, was waiting by the roadside. She said that she had a 2 to tell me. About six months 3 it seemed that I had 4 a letter to her which had her street 5 on it but was addressed to another house with the 6 number on a different street in her neighborhood. She decided to drop off the letter to the correct house. It turned out that the letter had been 7 for Johnson, who happened to be 8 . They talked for a little while and later on he 9 . Then they started dating (约会) and had been going 10 together ever since. I felt sorry for delivering the letter wrong, but I was 11 that I had brought these nice people together. A few months later a(n) 12 sign went up in Christy`s yard. and then the wedding 13 were sent out. Soon the house was sold,the wedding happened, 14 Christy, with her kids, moved into Johnson`s house. A few months later, I saw a For Sale sign in 15 yard. I feared the 16 might be trouble, so I made up a(n) 17 to go to their door and check on them. Christy opened the door,smiled broadly, and 18 to her huge stomach "We are having twins!" she said, "This house won`t be big enough, so we have to 19 ." I suddenly realized that my one 20 letter was now giving two little yet-to-be-born people a shot at life. Great! | ||||
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