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
2008-11-13
55
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 flight particularly take-off and landing. Some experts have gone further, calling for a total ban during all flights. (76)
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 riel& might affect all aircraft’s computers. (77)
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 systems in order to damage navigation equipment. (78)
As worrying, though, is the passenger who can’t hear the instructions to turn off his radio because the music’s too loud.
选项
A、a new rule 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
本题问及全篇的主旨。文章主要谈论的是在飞机上使用便携式电子设备可能是引起空难的一个原因。因此,答案是C项。
转载请注明原文地址:https://kaotiyun.com/show/1aPO777K
0
成人本科学位英语
相关试题推荐
TheheadsofsomeofRussia’smostprestigiouseducationalestablishmentsyesterdayadmittedthatstudentsusesurrogates(代理人)
Globalclimatechange,oftenseenasaprocessstretchingoverthousandsofyears,couldinfactoccurabruptlyandunexpectedly
Forcenturies,explorershaveriskedtheirlivesventuringintotheunknownforreasonsthatweretovaryingdegreeseconomican
"Cultureshock"occursasaresultoftotalimmersioninnewculture.It【C1】______to"peoplewhohavebeensuddenlytransplanted
"Cultureshock"occursasaresultoftotalimmersioninnewculture.It【C1】______to"peoplewhohavebeensuddenlytransplanted
Inlearningaforeignlanguage,______English,oneshouldfirstpayattentiontospeaking,whichisthegroundworkofreadingan
Themonkslet______outsidetheirenclosures,andthentheyhavegreatfreedomtoo.
Whatdoestheword"cheer"(Line2,Para.1)imply?Accordingtothispassage,somepeoplebelievethateventually______.
他25岁时接替他父亲当了公司的经理。结果证明他比父亲更成功。
随机试题
男,28岁。高血压、蛋白尿、水肿多年。1年前曾查血Cr220μmol/L,B超双肾缩小。近2周恶心、呕吐加重。测血压25/14kPa(190/105mmHg)其临床表现不包括()
下列哪些选项体现了集中审理原则的要求?()
下列是电缆沟内电缆敷设的要求,其中错误的是()。
在“资源管理器”中双击一个Word文件,可()。
如果2个月后票据到期,乙公司无力偿还票款,A公司和乙公司分别应编制的会计分录是()。(11.1)
掘土派
求下列曲面的方程:以曲线为母线,绕z轴旋转一周而生成的曲面;
通常数据链路层交换的协议数据单元被称为______。
Oneofmy______cametoseemeonSundaymorning.
A、Tohavesomeonefixhiscomputer.B、Totrainhimhowtotakeexams.C、Tohelphimwithhishouse-cleaning.D、Tobehisguidea
最新回复
(
0
)