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
8
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
ThemainpurposeofthisarticleistohighlypraiseIngridforherdedicationt
DISCLAIMER:Thise-mailisconfidentialandshouldnotbeusedbyanyonewho
A公司系电视机生产和销售企业。2021年度销售电视机5000台,每台售价为0.4
不属于五行中“土”的是A.五方中的中 B.五官中的口 C.五脏中的脾 D.
A.黄体酮 B.复方氯地孕酮 C.棉酚 D.双炔失碳酯 E.氯米芬以上属
房地产状况调整的分解不包括( )。A.区位状况调整 B.实物状况调整 C
按照《房地产开发企业资质管理规定》规定,W省A市房地产开发公司申报一级资质,由(
关于期货公司的表述,正确的有( )。A.为客户提供期货市场信息 B.为客
可降低消化性溃疡复发率最有效的措施是( )。A.药物治疗 B.高选择性迷走神
对恶性综合征的描述,不正确的是A.肌酸磷酸激酶浓度增高 B.多在长期使用非典型
最新回复
(
0
)