首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
A、Another class of fires. B、Another type of extinguishers. C、How fires break out. D、How fires can be prevented. AWhat would the
A、Another class of fires. B、Another type of extinguishers. C、How fires break out. D、How fires can be prevented. AWhat would the
admin
2009-04-23
32
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、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
What would the author probably discuss in the paragraph that follows?
转载请注明原文地址:https://kaotiyun.com/show/UNC7777K
0
大学英语四级
相关试题推荐
A、Pleasant.B、Funny.C、Horrified.D、Desperate.C
A、Thepsychologyofourfutureselves.B、Thephilosophyofpreventingregrets.C、Thepsychologyofourpastselves.D、Thephilos
A、Becauseitisenjoyabletocookathome.B、Becauseitistime-consumingtoeatoutside.C、Becauseitisexpensivetoeatoutsi
A、Fromvariousresearchproposals.B、FromTVprograms.C、Fromaconversationwithaparent.D、Fromaconversationwithachild.
A、Achemistryassignment.B、Astudytheirchemistryprofessordid.C、Acoursethewomanistaking.D、Ajobpossibility.D主旨大意题。女
A、Toturntoelectroniccigarettes.B、Tousemedicineornicotinepatches.C、Totakemedicineandcounselingservices.D、Tostop
A、ItwasbroughttothePhilippinesinthe19thcentury.B、ItisnotanofficiallanguageinthePhilippines.C、Itisspokenby
A、Theyencouragemorehomelesspeople.B、Theyareasafetyhazard.C、Theytakeupparkingspaces.D、Theydestroytheneighborhoo
It’snormaltothinkofaconversationastakingplacebetweenpeoplewhoareinthesameroom,surroundedbythesamesetofph
随机试题
A.肠梗阻B.腹泻C.瘘管形成D.杵状指(趾)E.肛周病变属于Crohn病并发症的是
你发现一名儿童床上没有反应,无外伤体征,你应如何开放气道
工作分解结构树状组织的最底层是细化后的()。
在商业组织理论中,基尼系数是衡量()的指标之一。
财政资源配置职能范围的大小,取决于()。
设xy=xf(z)+yg(z),且xf’(z)+yg’(x)≠0,其中z=x(x,y)是x,y的函数.证明:
FewwritersareasreveredasJaneAusten.AccordingtoapollinMarch,PrideandPrejudice—aromancewithoutasinglekiss—is
Someexpressionshavemadeajumpfromsportseventstoeverydaylife.Onesuchexpressionisfallguy.Afallguyistheperson
Accordingtothepassage,asurveyaboutbutterfliesiscarriedonby________.
A、Havearest.B、Takeawalk.C、Haveadrink.D、Gettosleep.B根据原文(8)处可知,男士早上不想睡懒觉,喜欢出去散步,故选B。
最新回复
(
0
)