问题 问答题 论述题

叙述脱硫保安系统正常运行方式?

答案

参考答案:

1)保安A、B段正常情况下由380V相对应的脱硫PCⅠ、Ⅳ段供电,柴油发电机组分别作保安A、B段的联锁热备用电源;

2)联锁热备用状态的规定:

①燃油、润滑油、水位正常,燃油进油门在开启状态;

②柴油机电池开关在合闸位置,电池充电器交流电源完好,充电器在开启状态(ON)并对电池进行浮充,电池电压显示正常(26V-28V);

③柴油机控制面板上的电源开关SA1(通/断/通)打至通位置,柴油机出口开关ZKK控制开关SA3(自动/分闸/合闸)打至自动位置,就地手动模式启动旋钮SA4(自动/怠速/高速)打至自动位置,控制器上的“自动/AUTO”灯亮;

④脱硫保安A/B段的双电源切换开关的控制开关打至自动位置;

⑤380V脱硫PCⅣ段失压跳B段馈线电源开关和失压启动柴油机的压板投入。

阅读理解

Directions: Read the following Passage. Answer the questions according to the in formation given in the

Passage and the required words limit. Write your answers on your answer sheet.

     Many college-bound freshmen are worrying about more than just who their roommates will be this fall.

They may also be nervous about the well-known fact that'they are likely to gain weight this school year.

While many of us remember the extra weight that showed up right around the start of our college careers,

we are not always clear on how much weight we realize gained or why.

     Many nutrition experts and psychologists think that it is the change in environment and the stress of a

new begjnning that cause the typical college freshmen to gain extra pounds. As students start a new stage

of their lives, many eat to deal with the stress of change or loneliness. Often, college students are making

meals or choosing foods independently for the first time in their lives. If they live in the college dormitory,

they have a wide variety of foods to select from that may be higher in calories and fatter than the foods they

consumed living at home. In addition college social events usually center around food. I clearly remember

sitting in my dorm cafeteria for two or three hours on a Saturday morning socializing with my new friends.

Instead of eating only one meal, we would start with breakfast, eat throughout the duration of our socializing,

and finish with lunch. Food also makes an appearance after late-night parties, as part of a school day, or

simply to break the monotony (单调).

     So will this year's typical freshmen really gain 15 pounds? According to a 2006 Tufts University study,

students enrolling in college this fall will gain weight, but maybe not the assumed 15 pounds. Based on the

students surveyed, the study found that men can expect to gain an average of 6 pounds and women an

average of 4.5 pounds during the freshman year.

1. What makes many college-bound freshman worried? (not more than 8 words)

    _____________________________________________________________________________________

2. What seems to play an important role in students' social events? (1 word)

    _____________________________________________________________________________________

3. What causes many college freshmen gain weight according to many nutrition experts and psychologists?

    (not more than 11 words)

    _____________________________________________________________________________________

4. What is the result of the 2006 Tufts University study? (not more than 11 words)

    _____________________________________________________________________________________

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