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
2024-03-05
39
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.
选项
A、Wheal it breaks out.
B、How it comes about.
C、What kind it is.
D、Where it takes place.
答案
C
解析
What should we first be clear about in choosing how to put out a fire?
转载请注明原文地址:https://tihaiku.com/zcyy/3507215.html
相关试题推荐
[originaltext]Collegeismorethanstudyingtogetadiploma.Readings,hom
[originaltext]Theworld’sfirstgunmadewith3Dprintertechnologyhasbee
[originaltext]Theworld’sfirstgunmadewith3Dprintertechnologyhasbee
[originaltext]EversinceStarbuckshadthebusinesswisdomtomakeWiFiits
[originaltext]EversinceStarbuckshadthebusinesswisdomtomakeWiFiits
[originaltext]W:Hello,Sam.ThisisPaulaHandson.Sorrytobotheryou.ButI’
[originaltext]W:Goodeveningandwelcometoourprogram.Today,we’lltalkabo
[originaltext]Fromfieldstudiestolaboratorystudies,weseethatwinning
[originaltext]Fromfieldstudiestolaboratorystudies,weseethatwinning
[originaltext]Shynessisthecauseofmuchunhappinessforagreatmanypeo
随机试题
Thehourglass,aninstrumentused______,usuallyconsistsoftwobulbsunitedb
Gateswasbornand【B1】_____inSeattle.At,theageof14,hefoundedacompu
运行管理是过程管理,是实现全网安全和动态安全的关键。运行管理中的终端管理包含三个
一般,石灰、石膏、水泥三者的胶结强度的关系是()。A.石灰>石膏>水泥 B.石
吐温-80属于哪类表面活性剂A.阳离子 B.阴离子 C.两性离子 D.非离
LD酶有几种结构不同的同工酶A.2 B.3 C.4 D.5 E.6
采用放射性核素法检测T淋巴细胞转化功能时,3H-TdR加入至培养基的时间是A.G
A.昏迷 B.痴呆 C.木僵 D.情感淡漠 E.情感低落患者表现为做事缺
诉讼文书一般由首部、正文(事实与理由部分)、尾部组成,下列哪些选项属于法院刑事判
人们可以根据法律规范的规定,事先估计到当事人双方将如何行为及行为后的法律后果,从
最新回复
(
0
)