问题 问答题

余热锅炉紧急停炉的条件有哪些?

答案

参考答案:

余热锅炉达到下列任一条件,进行紧急停炉:

1.锅炉严重满水;

2.锅炉严重缺水;

3.锅炉水位计或安全门完全失效;

4.燃机排气异常,危机锅炉机组安全运行;

5.锅炉汽、水管道爆破及元件损坏,危及设备和人身安全;

6.锅炉钢架、护板严重损坏;

7.汽轮机保护动作须紧急停炉;

8.过热蒸汽温度高二值,而保护不动作;

9.冷再热温度高三值,而保护不动作;

10.热再热温度高二值,而保护不动作;

11.烟道出口烟气压力高;

12.达到锅炉跳闸条件而保护不动作时。

写作题

阅读下面的短文, 然后按照要求写一篇150词左右的英语短文。

Gaby Lucy is just a 17-year-old American girl, but she has experienced life in the Dominican Republic as a volunteer. When she recalls her time volunteering there, she doesn’t think about the fact that she had no running water and lived in a small house outside. Instead, she remembers fondly the people she met, the work she did with a youth group to improve accessibility to a local library and the leadership skills she gained.

American teens are setting an example to their parents through their volunteer work, according to a new survey by Harris Interactive. The random national telephone survey released this week found that more teens volunteer to support a charitable cause(慈善事业) – 56 percent – than have a part-time job –39 percent. Parents said 82 percent of the teens in their lives do something to support charitable causes, including volunteering, inviting others to a cause or donating money.

【写作内容】

1.以约30个词概括短文的内容要点;

2.以约120个词就 “青少年从事志愿者工作” 这个主题发表你的看法,并包括以下要点:

(1) 青少年从事志愿者工作的意义;

(2) 简述一次你自己或你身边的人从事志愿者工作的经历和感受;

(3) 请你向同龄中学生发出号召。

【写作要求】

1.在作文中可以使用亲身经历或虚构的故事,但不得直接引用原文中的句子;

2.作文中不能出现真实姓名和学校名称。

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