首页
登录
职称英语
[originaltext] To extinguish different kinds of fires, several types of fire
[originaltext] To extinguish different kinds of fires, several types of fire
游客
2023-08-26
56
管理
问题
To extinguish different kinds of fires, several types of fire extinguishers have been invented. They must be ready for immediate use when fire breaks out. Most portable kinds operate for less than a minute, so they are useful only on small fires. The law requires ships, trains, buses and planes to carry extinguishers.
Since fuel, oxygen and heat must be present in order for fire to exist, one or more of these things must be removed or reduced to extinguish a fire. If the heat is reduced by cooling the material below a certain temperature, the fire goes out. The cooling method is the most common way to put out a fire. Water is the best cooling material because it is low in cost and easy to get.
Another method of extinguishing fire is by cutting off the oxygen. This is usually done by covering the fire with sand, steam or some other things. A blanket may be used to cover a small fire.
A third method is called separation, which includes removing the fuel or material easy to burn from a fire, so that it can find no fuel.
The method that is used to put out a fire depends upon the type of fire. Fires have been grouped in three classes. Fires in wood, paper, cloth and the like are called Class A fires. These materials usually help keep the fire on. Such fires can be stopped most readily by cooling with water.
Questions 16 to 18 are based on the passage you have just heard.
16. Which method is often used if we cover a small piece of burning wood with a basin in order to stop the fire?
17. What should we first be clear about in choosing how to put out a fire?
18. What would the speaker probably discuss in the paragraph that follows?
选项
A、Another class of fires.
B、Another type of extinguishers.
C、How fires break out.
D、How fires can be prevented.
答案
A
解析
短文末尾对火灾进行了三个等级的划分,但只介绍了Class A,接下来自然是要介绍其他等级,故答案为A)。
转载请注明原文地址:http://tihaiku.com/zcyy/2958712.html
相关试题推荐
[originaltext]IntheUnitedStatesmanyhavebeentoldthatanyonecanbeco
[originaltext]IntheUnitedStatesmanyhavebeentoldthatanyonecanbeco
[originaltext]Hollywoodproducesmanydifferentkindsoffilms,includingm
[originaltext]Intheearlydaysofrailroadshorsespulledthetrains.The
[originaltext]W:Thankyou,thankyouandwelcometoeveryone’sfavoritegames
[originaltext]W:Thankyou,thankyouandwelcometoeveryone’sfavoritegames
[originaltext]W:Thankyou,thankyouandwelcometoeveryone’sfavoritegames
[originaltext]W:Hmm,hi.M:Hi,Iamgoingdoortodoortonighttotellpeople
[originaltext]M:IfIeverseethatguyagain,I’mdefinitelygoingtotellhim
[originaltext]M:IfIeverseethatguyagain,I’mdefinitelygoingtotellhim
随机试题
(Encourage)______bythehighmarksoftheexamination,hestudiedevenharder
【S1】[br]【S6】E护士的工作得到了肯定。因此,内战后培养护士以备用时之需也就成了重要工作。所以,应选readily。
Itneverrainsbutitpours.Justasbossesandboardshavefinallysorted
A.4 B.9 C.18 D.33
A.0.12~0.13 B.0.13~0.14 C.0.14~0.15 D
下列财产只能为国家所有的是( )。A.土地 B.矿藏 C.自然资源 D.
在Windows操作系统中,ipconfig/all命令的作用是()。A
根据计算机的( ),计算机的发展可划分为四代。A.体积 B.应用范围 C.
沉入桩施工安全技术措施的制定,主要依据()等选择适宜的沉桩方法和机具后进行。A、
可通过骨髓移植治疗的贫血是() A.缺铁性贫血 B.巨幼细胞性贫血 C.慢
最新回复
(
0
)