问题 单项选择题

为防止炉膛和尾部烟道再次燃烧造成破坏,常采用在炉膛和烟道易爆处装设( )。

A.超温报警和联锁保护装置

B.高低水位警报和低水位联锁保护装置

C.锅炉熄火保护装

D.防爆门

答案

参考答案:D

解析: 本题考核的是锅炉的保护装置。超温报警装置安装在热水锅炉的出口处,当锅炉的水温超过规定的水温时,自动报警,提醒司炉人员采取措施减弱燃烧。超温报警和联锁保护装置联锁后,还能在超温报警的同时,自动切断燃料的供应和停止鼓风、引风,以防止热水锅炉发生超温而导致锅炉损坏或爆炸。当锅炉内的水位高于最高安全水位或低于最低安全水位时,水位警报器就自动发出警报,提醒司炉人员采取措施防止事故发生。当锅炉炉膛熄火时,锅炉熄火保护装置作用,切断燃料供应,并发出相应信号。防爆门是为防止炉膛和尾部烟道再次燃烧造成破坏,常采用在炉膛和烟道易爆处装设的装置。

阅读理解

阅读理解。

     Occasional sleepwalking does not tend to present a problem and most children grow out of it. If it

happens every night and causes problems, then sleep disorder specialists suggest that parents spend a

week noting the time when sleepwalking tends to happen, and then gently wake the child about fifteen

minutes before this time. This will often break the cycle.

    So what should you do if you find your relative sleepwalking? For a start, they are in such a deep sleep

that they will probably not notice you, even if you try to wake them. If you do succeed in walking them,

they will become distressed. Everyone has experienced that feeling of confusion when the alarm awakens

you from deep sleep, instead of the lighter sleep we are usually experiencing by the time our alarms

sound. I once had the shock of being woken by a crash and found myself in the kitchen, standing

barefoot and surrounded by broken glass. I'd tried to get a glass of water while sleepwalking, but like

most sleepwalkers I failed to turn on the light, and had smashed the glass against the tap.

    Walking a sleepwalker will not cause them to have a heart attack, but the kindest thing to do is not try

to wake them at all. Lead them gently back to bed so that they do not hurt themselves. They will remain

deeply asleep, and it is likely that will not remember a thing in the morning.

1.What do the specialists advise the parents to do to avoid their children's sleepwalking?

A. Go to bed with their children at the same time.

B. Keep a record of the time when children wake up.

C. Take 15 minutes to wake children from sleepwalking.

D. Try some time to break the cycle of the sleepwalking.

2. When a sleepwalker is suddenly woken, he is most likely to   ___  .

A. die from heart attack    

B. do some cooking

C. feel lost    

D. become relaxed

3.What should we do to deal with a sleepwalking relative?

A. Do nothing but take him back to bed.

B. Try every means to wake him at once.

C. Leave your relative where he stays.

D. Send him to a specialist immediately.

4. What is the best title for the text? 

A. Sleep Disorder  

B. Sleepwalking    

C. Sleep Advice    

D. Sleepwalkers

单项选择题