问题 问答题 简答题

造成强制循环汽包锅炉水冷壁管损坏的可能原因有哪些?

答案

参考答案:

(1)锅炉给水品质不合格,锅水化学处理不当,长期运行在管内,造成腐蚀或结垢;

(2)设备制造、焊接质量差;

(3)燃烧器附近水冷壁被煤粉磨损严重;

(4)火焰中心偏斜,升压速度太快,导致水循环被破坏;

(5)锅炉运行中严重缺水;

(6)个别水冷壁人口节流圈堵塞;

(7)炉内结焦严重,造成受热不均;

(8)吹灰介质直接吹到水冷壁上,吹坏水冷壁;

(9)管内被异物堵塞,致使水循环不良;

(10)大焦块落下,将水冷壁砸坏。

选择题
阅读理解

阅读理解

     Compared to people with bad attitudes,  people who are cheerful and relaxed are less likely to suffer

from colds,  according to a new study."It's possible that being upbeat helps the body fight illnesses,  "

says Sheldon Cohen,  the study's lead researcher from Carnegie Mellon University (CMU) in Pittsburgh.

     In a previous study,  Cohen and his colleagues put coldcausing viruses into the noses of 334 healthy

adults.People who tended to be cheerful and lively were least likely to develop sniffles,  coughs,  and

other cold symptoms.People who showed positive feelings were also less likely to mention symptoms to

their doctors,  even when medical tests detected those symptoms.

     Those findings were interesting,  but they didn't prove that a person's attitude affects whether he or

she gets sick.Instead,  it was still possible that a person's underlying personality is what matters.Evidence

suggests,  for instance,  that certain people are naturally more likely to be outgoing and optimistic,  with

high selfesteem and a sense of control over life.This would mean that who we are,  not how we feel,  

ultimately decides our chances of catching colds.

     To figure out which mattered more (personality or emotions),  the CMU team interviewed 193

healthy adults.The researchers talked to each person over the phone every evening for 2 weeks.At the

end of the interviewing period,  people got nose drops that contained either cold or flu viruses.Then,  

each person stayed in an isolated room for 5 or 6 days.The results showed that everyone in the study

was equally likely to get infected.Their symptoms,  however,  differed depending on the types of emotions

that they had reported over the previous 2 weeks.Among those who reported good moods and had been

infected with the flu virus,  for example,28 percent developed coughs and stuffy noses.On the other

hand,  those symptoms struck 41 percent of people who had been less upbeat.

1. What would be the best title for the passage?

A. Smiles Turn away Colds

B. An Interesting Way to Beat Colds

C. Be Outgoing and Optimistic to Fight Colds

D. What Matters More,  Personality or Emotions?

2. In the previous study,  people who showed positive feelings______.

A. didn't catch colds as often

B. developed cold symptoms more slowly

C. were less likely to have cold symptoms detected

D. were less likely to feel cold symptoms

3. What mainly decides our chances of catching colds according to the new study?

A. Personality.  

B. Selfesteem.

C. Emotions.  

D. Attitudes.

4. The underlined word "symptoms" probably means________.

A. something that causes cold

B. something that results in cold

C. signs that something exists,  especially something bad

D. changes in your body or mind that show that you are not healthy