问题 问答题 简答题

锅炉为什么要设置减温器?

答案

参考答案:

在锅炉实际工件中,过热器出口的蒸汽温度常与设计值不同而且经常上下波动,过热蒸汽超温将危及锅炉长期安全运行,因此,在运行中要对过热蒸汽超温进行调节,在过热器部位设置减温是从蒸汽侧进行汽温调节的一种常用方法,这种方法是用给水,炉水或蒸汽凝结水作冷却水通过过热器某一部位或直接喷入过热蒸汽中吸收过热蒸汽的热量,从而降低过热蒸汽温度,但是它不可能在蒸汽温度过低时用以提高蒸汽温度,因此这种过热蒸汽温度节器常称为减温器.

完形填空

阅读表达(共5小题;每小题3分,共15分)

While it is impossible to live completely free of stress, it is possible to prevent stress as well as reduce its effect when it can’t be avoided. The US Department of Health and Human Services offers the following suggestions for ways to deal with stress.

• Try physical activity

When you are nervous, angry or upset, try releasing the pressure through exercise or physical activity. Running, walking, playing tennis, or working in your garden are just some of the activities you might try.

• Take care of yourself

You should make every effort to eat well and get enough rest. If you easily get angry and cannot sleep well enough, or if you’re not eating properly, it will be more likely that you will fall into stressful situations. If stress repeatedly keeps you from sleeping, you should consult a doctor.

• Make time for yourself

Schedule time for both work and entertainment. Don’t forget, play can be just as important to your overall well-being as work. You need a break from your daily routine to just relax and have fun. Go window-shopping or work on a hobby. Allow yourself at least a half hour each day to do something you enjoy.

• Make a list of things to do

Stress can result from disorganization and a feeling that “there’s so much to do, and not enough time”. Trying to take care of everything at once can be too much for you and as a result, you may not achieve anything. Instead, make a list of everything you have to do, then ______________________, checking off each task as it is completed. Set out to do the most important tasks first.

小题1: What is the best title of the passage? (Please answer within 10 words.)

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小题2: Which sentence in the passage can be replaced by the following one?

You might feel stressed as a result of bad temper, poor quality of sleep or diet.

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小题3: Please fill in the blank in the last paragraph with proper words or phrases to complete the sentence. (Please answer within 10 words.)

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小题4: Which of the suggestions do you think is the best for you? Why? (Please answer within 30 words.)

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小题5: Translate the underlined sentence in the first paragraph into Chinese.

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