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
The biggest safety threat facing airlines today may not be a terrorist with a gun, but the man with the portable computer in bus
The biggest safety threat facing airlines today may not be a terrorist with a gun, but the man with the portable computer in bus
admin
2011-06-29
47
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 (航空) industry, has recommended that all airlines ban (禁止) such devices from being used during "critical" stages of light, 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 (易受损的) to interference raises the risk that terrorists may use radio system 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.
The passage is mainly about ______ .
选项
A、a new regulation for all airlines
B、the defects of electronic devices
C、a possible cause of aircraft crashes
D、effective safety measures for air flight
答案
C
解析
该文主要讨论发生空难的原因。
转载请注明原文地址:https://kaotiyun.com/show/Qr6O777K
0
考博英语
相关试题推荐
Beth,Mytrain’sbeencancelledforthesnowstorm.I’mafraidthemeetingshouldgoaheadwithoutme.JoeThemeeting
SprintWantsYourIPhoneRememberthemapwarsbetweenAT&TWirelessandVerizonWireless?SprintNextelthoughtitlookedl
Lookatthelistbelow.Itshowsthedepartmentsofacompany.Forquestions,decideinwhichdepartment(A-H)eachpersononth
Itisprobablyboththatheisgoingtothemeetingontime______bythemorningtrafficjam.
Severaltrialeffortsinthe1980sprovedthatitwasfinancially______torestoreoldbuildings.
Fortenyearstheproblemaboutthewaterhasnotbeensolved,wecametothinkthatithasbeena______probleminthisarea.
Superstitionisadifficultquestion.WecannotquitesaythatsuperstitioninBritainisdead.Itshistoryisboth【76】longand
AccordingtoBrown’sstudy,women’searningcategoriesoccurin______.
Analystshavehadtheirgoathumor,andIhavereadsomeofthisinterpretativeliterature,butwithoutbeinggreatlyinstructe
71.Scienceisoftenhardtoread.Mostpeopleassumethatitsdifficultiesarebornoutofnecessity,outoftheextremecomple
随机试题
有关细胞凋亡正确的描述是
下述体层轨迹,滤线栅方位不变的是
A、盆腔子宫内膜异位症B、盆腔结核C、卵巢恶性肿瘤D、卵巢畸胎瘤E、慢性盆腔炎原发不育,月经稀少,检查子宫略小不活动,双附件区触到不规则串珠样结节。可能的诊断为
头重如裹,周身困重,四肢酸懒沉重是感受何种外邪
论一般累犯和特别累犯的区别。
下列关于征收与征用区别的说法,错误的是()。
网络操作系统的______服务为用户的文件安全与保密提供眼务。
Whatisatfaultinourpresentsystemisnottheoutcomebutthefallibleprocedure.
ItcanbeinferredfromthefirstparagraphthatWhichofthefollowingstatementsisTRUEaboutsomedoctorsSomersquotesin
HintsandTipstoSaveMoneyA)Spendless.Thisisnotoversimplifyingthebestwaytosavemoney!Itisessentialifyoua
最新回复
(
0
)