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
Rescue Platform In the aftermath of the terrorist attacks on the World Trade Center, security experts are trying to develop new
Rescue Platform In the aftermath of the terrorist attacks on the World Trade Center, security experts are trying to develop new
admin
2009-06-15
62
问题
Rescue Platform
In the aftermath of the terrorist attacks on the World Trade Center, security experts are trying to develop new ways of rescuing people from burning skyscrapers. One idea is a platform capable of flying vertically and hovering in the air like a helicopter. The platform would rise up and down alongside a skyscraper and pick up people trapped in high stories.
The idea for the vertical takeoff platform was hatched more than ten years ago by a Russian aerospace engineer, David Metreveli, who has since moved to Israel. Metreveli’s design, called the Eagle, calls for two jet engines that turn four large horizontal propellers. The spinning of the propellers generates the necessary lift, or upward force, to raise the platform. The more power is supplied to the propellers, the higher the platform rises. Moving the platform sideways involves applying differing amounts of power to each propeller.
Helicopters are now used in some cases to get people out of burning buildings. Escape baskets slung from them dangle beside the building for people to climb into. Unfortunately, the baskets cannot reach every floor of a building because the ropes from which they hang become unstable beyond a certain length.
So far, Metreveli has built a small-scale model of the Eagle to test his idea. In the wake of September 11, he has been able to secure enough funding to start building a larger, 4-meter by 4- meter prototype, which he calls the Eaglet.
选项
A、Right
B、Wrong
C、Not mentioned
答案
B
解析
本题给出的信息是错误的。第二段说到,救生平台既可垂直升降,也可侧向移动。
转载请注明原文地址:https://jikaoti.com/ti/8xOsFFFM
本试题收录于:
职称英语理工类基础题库职称英语分类
0
职称英语理工类基础
职称英语
相关试题推荐
HospitalMistreatmentAccordingtoastudy,mostmedicalinternsreportexperiencingmistreatment,includinghumiliationbyseni
CharterSchoolsAmericanpubliceducationhaschangedinrecentyears.OnechangeisthatincreasingnumbersofAmericanparents
CharterSchoolsAmericanpubliceducationhaschangedinrecentyears.OnechangeisthatincreasingnumbersofAmericanparents
TheDiscoveryofPenicillin(青霉素)Intheautumnof1928,aScottishscientistAlexanderFlemingwassearchingforasubstance
SomeplantsandanimalsdevelopsuperiorcharacteristicssothattheymayWhichofthefollowingisnotdirectlymentionedint
FriendsMayBeKeytoLivingLongerLookingforthesecretofalonglife?Lookcloselyatyourfriends.Newresearchsugges
Scientistsworkingonaproblemdonotknowandsometimescan’tevenguesswhatthefinalresultwillbe.LateonFriday,8Nove
TheeconomycontinuedtoexhibitsignsofdeclineinSeptember.
Whycan’tyoustopyour(eternal)complaining?
AvalancheandItsSafetyAnavalancheisasuddenandrapidflowofsnow,oftenmixedwithairandwater,downamountainside.A
随机试题
企业家在智能素质方面的显著特征是
与针对TD-Ag体液免疫应答有关的细胞有
提示右心室肥大的心电图表现是
PRP应检测MIC的药物是
隐血试验前3天,下列哪项食物可以选用
阅读材料,根据要求完成教学设计。“遗传信息的携带者——核酸”这节内容是新课程人教版高中生物教材必修一《分子与细胞》中第二章第三节的内容。在第二章中,教材重点从微观方面介绍了组成细胞的分子基础,主要介绍了组成细胞的元素和化合物,前面两节已经介绍了组
写出下列命题的否定和否命题.(1)所有能被6整除的数都能被3整除.(2)若a>2,b>2,则a+b>4.(3)存在实数x,使x>3.
阅读下面的文字,回答以下问题。从花粉到花生,让人类产生过敏变态反应的东西实在太多了。变态反应研究起步相对较晚,“变态反应”这一术语是儿科医生冯.皮尔凯和贝拉,锡克在20世纪初首先提出的。几乎同一时期,“过敏症”使生理学家查尔士.里歇声名远播并荣膺
Java程序的编译和执行模式包括2点,是【】和半解释。
MOROSE:
最新回复
(
0
)