问题 问答题 简答题

给水泵再循环门的操作规定

答案

参考答案:

⑴正常运行中再循环门隔离门一般不得关闭;

⑵#1、2机给水泵再循环门在180MW及以下低负荷时切“MAN”方式运行,一般情况下不要切至“LOCAL”方式运行。机组升负荷至190MW及以上时,两台汽泵再循环门缓慢关闭后切“自动”;

⑶给水泵再循环门切“MAN”时,必须保证有20%以上反馈开度,视负荷、前置泵出口流量及两台泵流量偏差做相应调节,一般在20~40%之间,前置泵出口流量不低于250t/h。

阅读理解

根据短文内容,从短文后的选项中选出能填入空白处的最佳选项。选项中的两项为多途选项。

     More than half of young black men in the United States do not finish high school. Many grow up without

fathers and in neighborhood with gangs, drugs and violence. Sixty percent of those who drop out of school

have spent time in prison by the age of thirty-five.

     Joe Marshall co-founded the Omega Boys Club in San Francisco, California twenty-three years ago. He

tries to give these children a safe refuge (避难所) and a better future. 1_____. Twice a week, it offers after-

school classes in math, reading family and life skills, and college preparation. In many ways, it serves as a

kind of family. It provides teenagers with structure and support.

     Mr. Marshall spent twenty-five years as a teacher and administration in San Francisco. 2_____ He sees

gangs and violence as a disease that needs to be dealt with as a public health problem.

     "We tell them to follow some new rules for living. 3_____." The Club represents what he calls the "alive

and free movement." 4_____ In 1991, Joe Marshall started "Street Soldiers", a weekly call-in show.

     Marlena was one of the graduates of the Omega Boys Club. "She's at Southern University right now, going

into her third year. She talked about what she had learned the hard way and how we help her learn that by

coming to Omega, by listening to 'Street Soldiers '. 5_____" Joe Marshall said.

     Mr. Marshall is sixty-three this year and he wants to build an institution. "I'm not going to be here forever,

so my big thing is to make sure this goes on."

A. She said she had learned how to love herself.

B. That's what these young people get in the street.

C. A lot of my former students ended up in prison for selling drugs.

D. But his most effective way to spread his anti-violence message is through radio.

E. The Omega Boys Club serves more than four hundred young people every year.

F. He taught math in middle school and expected to see his best students go to school.

G. These rules will decrease their chances of ending up dead or in prison and increase their chances

     dramatically of staying alive and free.

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