问题 问答题 简答题

简述水库调度自动化系统中日弃水调峰损失电量计算公式。

答案

参考答案:

日弃水调峰损失电量(万kw·h)=min﹛max[min(N实max,N,N)–N实均,0]*24,W

N实max为日实际运行最大总出力(由96点负荷查出最大值);

N均为日平均出力(日实际发电量/24);

N为日实际运行水头下的额定发电能力;N=m*N

N为实际投运机组情况下的铭牌容量;N=m*N

m为实际可以投运的机组台数(含备用机组);

N为日实际运行水头下的单机最大限制出力,由水头~限制出力线查算;

N为单机铭牌容量;

W为日实际弃水量;

η为日实际发电耗水率。

阅读理解

John Smith was a good math student at a high school. He loved his computer. He came home early every day. Then he worked with it till midnight. But John was not a good English student, not good at all. He got an F in his English class. One day after school, John joined his computer to the computer in his high school office. The school office computer had the grades of all the students: the math grades, the science grades, the grades in arts and music, and grades in English. He found his English grade. An F! John changed his English grade from F to A. John’s parents looked at his report card. They were very happy. “An A in English!” said John’s Dad. “You are a very clever boy, John. ”

John is a hacker. Hackers know how to take information from other computers and put new information in. Using a modem, their computers are connected to other computers secretly. School headmasters and teachers are worried about hackers. So are the police, for some people even take money from bank computer account(帐户)and put it into their own ones. And they never have to leave home to do it! They are called hackers.

小题1:John changed his English grade with the computer in ______.

A.the classroom

B.the school office

C.a bank near his house

D.his own house小题2:When John’s parents saw the report, they were happy because ______.

A.John was good at math

B.John loved computers

C.John could join one computer to another

D.they thought John was not poor in English any longer.小题3:Who are worried about hackers in the story?

A.John’s parents

B.School headmasters, teachers and the police.

C.The police.

D.School headmasters and teachers.小题4:What should the hackers know well, do you think, after you read this story?

A.Information

B.Bank computer accounts

C.Computers

D.Grades小题5:The last paragraph is about _______.

A.John

B.computers

C.hackers

D.modem

单项选择题