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
2010-03-03
38
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 to 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 aircrafts 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 aircrafts 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.
Few airlines want to impose a total ban on their passengers using electronic devices because
选项
A、they don’t believe there is such a danger as radio interference
B、the harmful effect of electromagnetic interference is yet to be proved
C、most passengers refuse to take a plane which bans the use of radio and cassette players
D、they have other effective safety measures to fall back on
答案
B
解析
推理题。文章第三段指出“because they (the experts)have not been able to reproduce these effects in s laboratory,they have no way of knowing whether the interference might be dangerous or not.”,因此航空公司对禁止在飞机上使用电子设备表现出犹豫不决,由此可以推断出航空公司没有彻底禁止机上乘客使用电子设备的原因是电磁干扰的破坏性影响尚未得到证实
转载请注明原文地址:https://jikaoti.com/ti/eH3MFFFM
本试题收录于:
大学英语三级A级题库大学英语三级分类
0
大学英语三级A级
大学英语三级
相关试题推荐
Notes:incentive奖励,激励offset抵消,弥补ongoing不间断的ThepurposeoftheYouthJobConnectionprogramistohelpbusinesses________.
A、Tochangeajob.B、Tobuyacar.C、Tobuyamotorcycle.D、Tochangeadepartment.Conversation2C对话结尾处,男士提议说买一辆汽车上班,女士说他们没有足够
Thefollowingisapartofthecontentsofacomputerhandbook.Afterreadingit,youarerequiredtofindtheitemsequivalent
A、One.B、Two.C、Three.D、Four.BHowmanypiecesofluggagedoesthewomanhave?本题为数字计算题。根据Ok,Ihavetwosuitcases.很容易选出答案。
WhatisthenameofthenewserviceontheInternet?Howdoestheserviceremindyouoftheimportantdates?Bysendingme____
Thoughtechnicallyquiteadvancedtoday,theInternetisfarfrombeingpopularwithaveragehouseholdusersinsomedeveloping
A、Themusic.B、Aweatherforecast.C、Sportnews.D、Areport.BM.Whatwilltheweatherbeliketomorrow?W:Thebroadcastsaysi
Thisarticleismadeofchoicematerials,superiorinquality,effectiveinrespellingmosquitoes(驱蚊),withsanitary(卫生的)effect
内容:新图书馆从2005年11月1日起恢复借还书,并规定凡2005年11月1日前从本馆借出图书的归还日期一律定为2005年12月15日,请在此之前归还,否则按逾期罚款处理。请大家相互转告。
Mr.Smithinsistedthathe______theworkallbyhimself,butnobodybelievedhim.
随机试题
自主神经系统活动的特点是
世行、亚行咨询服务的合同类型包括()。
围堰按材料分为()等。
根据税收相关法律的规定,下列说法正确的是()。
甲进出口公司代理乙工业企业进口设备,同时委托丙货运代理人办理托运手续,海关进口增值税专用缴款书上的缴款单位是甲进出口公司。该进口设备的增值税纳税人是()。(2011年)
计算下列指标时,不需要基准折现率的有()。
甲环保局以其设备对外提供担保,担保合同有效。()
“固定资产清理”科目的核算内容包括()。
郑某有一翡翠,他在去朋友蒋某家的路上将其丢失,该物被蒋某的邻店张某捡到,张某捡到后见该翡翠漂亮便镶了白金制成了吊坠,后郑某发现向张某索要,则()。
DearCustomer,Congratulations!Youhavejustpurchasedoneoftheworld’smostsophisticatedmicrowaveovens.Thisapplianc
最新回复
(
0
)