首页
登录
职称英语
The biggest safety threat facing airlines today may not be a terrorist with
The biggest safety threat facing airlines today may not be a terrorist with
游客
2023-11-21
27
管理
问题
The biggest safety threat facing airlines today may not be a terrorist with a gun, but the man with the portable computer in business class. In the last 15 years, pilots have reported well over 100 incidents that could have been caused by electromagnetic interference. The source of this interference remains unconfirmed, but increasingly, experts are pointing the blame at portable electronic devices such as portable computers, radio and cassette players and mobile telephones.
RTCA, an organization which advises the aviation industry, has recommended that all airlines ban such devices from being used during "critical" stages of flight, particularly take-off and landing. Some experts have gone further, calling for a total ban during all flights. Currently, rules on using these devices are left up to individual airlines. And although some airlines prohibit passengers from using such equipment during take-off and landing, most are reluctant to enforce a total ban, given that many passengers want to work during flights.
The difficulty is predicting how electromagnetic fields might affect an aircraft’s computers. Experts know that portable devices emit radiation which affects those wavelengths which aircraft use for navigation and communication. But, because they have not been able to reproduce these effects in a laboratory, they have no way of knowing whether the interference might be dangerous or not.
The fact that aircraft may be vulnerable to interference raises the risk that terrorists may use radio systems in order to damage navigation equipment. As worrying, though, is the passenger who can’t hear the instructions to turn off his radio because the music’s too loud. [br] What is said about the over 100 aircraft incidents in the past 15 years?
选项
A、They may have been caused by the damage to the radio systems.
B、They may have taken place during take-off and landing.
C、They were proved to have been caused by the passengers’ portable computers.
D、They were suspected to have resulted from electromagnetic interference.
答案
D
解析
就“在过去15年中的100多次飞行事故”,作者在第一段指出:“In the last l5 years,pilots have reported well over l00 incidents that could have been caused by electromagnetic interference.”,由此可见A 错误,而D 为正确答案。由于作者认为这些事故“可能”是包括手提电脑在内的电子设备的电磁干扰引起的,而这一点尚未得到证实,故C 错误。B 在文中未提及。
转载请注明原文地址:https://tihaiku.com/zcyy/3206692.html
相关试题推荐
PassageOne[br]Whatdotheexamplesofairshowandthebiggestshipindicate
PassageOne[br]Whatdotheexamplesofairshowandthebiggestshipindic
PassageTwo[br]WhatdoesthecaseofairlinesinPara.8show?Thetransiti
Whatisthelatestproblemfacingpeoplewhodrivetoschool?[br][originaltex
WhatplaguearesomeAfricancountriesfacing?[originaltext]AUnitedNatio
______politicianswerekilledintheterroristattack.[br][originaltext]A
Ithreatenedto_________________hisplantothepolice.A、revealB、exposeC、dis
Wefinditimpossibleto______withthelatestsafetyregulations.A、accordB、un
AccordingtoMr.Annan,whatmaybeasourceofproblemsfacingtheworld?[br]
WhichofthefollowingisNOTlistedasterroristgroupbytheUS?[originaltext
随机试题
Accordingtothenews,UEFA[originaltext]ThePresidentoffootball’sworld
Whywork?【C1】______youhaveperiodicallyaskedyourselfthesamequestion,
EatingOurYoung[A]AtFeltonvilleSchoolofArtsa
AsEnglishSpreads,IndonesiansFearforTheirLanguagePauli
45岁,阴道细胞学检查为巴氏Ⅱ级,宫颈活检为鳞状上皮化生,提示A.宫颈癌 B.
A.浮脉 B.芤脉 C.革脉 D.虚脉 E.散脉浮大中空,如按葱管的脉象
在龙口建造浮桥,沿龙口前沿抛投块料,使堆筑戗堤均匀上升的是( )。 A、平堵
从2008年3月1日起,对个人出租住房征收增值税的税率是()。(2011年真
矿山建设工程中,决定地面生产系统布局和影响施工设施布局的主要是()。A.施工方
下列能够发挥蛋白质互补作用的最佳搭配是A.小米和大米 B.花生和大豆 C.玉
最新回复
(
0
)