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. A短文末尾对火灾进行了三个等级的
A、Another class of fires. B、Another type of extinguishers. C、How fires break out. D、How fires can be prevented. A短文末尾对火灾进行了三个等级的
admin
2012-05-28
105
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 26 to 28 are based on the passage you have just heard.
26. Which method is often used if we cover a small piece of burning wood with a basin in order to stop the fire?
27. What should we first be clear about in choosing how to put out a fire?
28. 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,但只提到了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:https://kaotiyun.com/show/c8E7777K
0
大学英语六级
相关试题推荐
Itisonlyrightthatthestarsshouldbepaidinthisway.Don’tthetopmeninindustryearn【B1】______salariesfortheserv
EntertainmentinLondonBuyingBooksLondonersaregreatreaders.Theybuyvastnumbersofnewspapersandmagazinesan
A、Trytoretainasmanynewwordsaspossible.B、Practicewordsatappropriateintervals.C、Learndifficultwordswiththehighe
Therearemanykindsoflibrariesintheworld.Andwecouldborrowbooksorgettheinformationfromit.Theymaybe【B1】______
A、HeisgoingtoProfessorHudson’shome.B、Heisgoingtothemovieswiththewoman.C、HeisgoingtothecinemawithJane.D、H
A、Hisvisionandhistravelallovertheworld.B、Hisexpertiseandbusinessmarketingskills.C、Themoneywepayforthe"infor
A、Fillsomeforms.B、HaveatestdriveinthePorsche.C、Havelunchwiththewoman.D、Tryhisluckinanothercarrentalcompany
A、Becausehewillhaveamonth-longbusinesstripinastrangecity.B、Becauseheneedsacartogotoworkbuthecan’tafford
A、Bothprivateandpubliccollegesarediscountingtuition.B、Schoolsarequiteconservativeondiscountingtuition.C、Allfresh
A、Sheisapplyingforastudentvisa.B、Sheisapplyingforfinancialaid.C、Sheisrunningaroundtheoffice.D、Sheisoffering
随机试题
经皮经肝胆道内引流术并发症有
此患儿最可能的诊断是此病X线检查,以下哪项是错误的
某企业在项目运行前三年,仍处于亏损状态,在此期间,可以免征()。
下列账户中,在会计期末一定没有余额的有()。
固定资产的平均折旧年限是()。
小明每隔一段相同的时间去一次书店。某段时间内小明去了十次书店,第一次是星期二,第五次是星期六,则最后一次去书店是()。
“秦时明月汉时关,万里长征人未还。但使龙城飞将在,不教胡马度阴山。”关于《出塞》这首诗,下列说法错误的是:
nullandvoid
•Readtheadvertisementbelowforarecruitmentexhibition.•Inmostofthelines(34-45)thereisoneextraword.Itiseithe
Thispassageismostprobablyintendedfor
最新回复
(
0
)