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
2011-03-01
49
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 a result, loud music sound makes the passenger unable to hear the instructions turning off his radio, this is the most worrying things to airlines.
Why is it difficult to predict the possible effects of electromagnetic fields on an airplane’s computers?
选项
A、Because it is extremely dangerous to conduct such research on an airplane.
B、Because experts lack adequate equipment to do such research.
C、Because research scientists have not been able to produce the same effects in labs.
D、Because it remains a mystery what wavelengths are liable to be interfered with.
答案
C
解析
第三段第二句给出了答案。
转载请注明原文地址:https://kaotiyun.com/show/3Akd777K
本试题收录于:
公共英语三级笔试题库公共英语(PETS)分类
0
公共英语三级笔试
公共英语(PETS)
相关试题推荐
Awebcamisadigitalcamerathatsendsvideoimagestoothercomputerusers.It’saboutthe【C1】______ofagolfballandtyp
Theostrich,thelargestbirdintheworldatpresent,livesinthedrierregionsofAfricaoutsidetheactualdeserts.Because
Youshouldspendabout20minutesonthistask.Thegraphbelowshowsradioandtelevisionaudiencesthroughoutthedayin1
Sometimeago,Idiscoveredthatoneofthechairsinmyfronthallhadabrokenleg.Ididn’tforeseeanygreatdifficultyin
Likefinefood,goodwritingissomethingweapproachwithpleasureandenjoyfromthefirsttastetothelast.Andgoodwriters
Britainwasawealthycountryahundredandfiftyyears【C1】______.Therewerea【C2】______veryrichpeople【C3】______receivedmone
Britainwasawealthycountryahundredandfiftyyears【C1】______.Therewerea【C2】______veryrichpeople【C3】______receivedmone
Wheredidthewomanfindoutabouttheuniversitystation?
Thelongyearsoffoodshortageinthiscountryhassuddenlygivenwaytoapparentabundance.Storesandshopsarechokedwithf
随机试题
寒性哮喘证见面色晦滞、四肢不温的机理是
庞德说“法律的生命在于它的实行”;霍姆斯说“法律的生命不在逻辑,而在经验”。运用法的实施的观点,针对上述的命题论述正确的是:
以下各项中,()人员不得参加报关员资格考试。
某公司通过境外代理商进口了一批应缴消费税的消费品,货价为550万元,其中包含了向境外采购代理人支付购货佣金50万元;该公司另外向境外支付特许权使用费25万元;此外,该批货物运抵我国关境需支付运费和保险费25万元。假设该货物适用关税税率为8%、增值税税率为1
我国著名乐曲《万马奔腾》是()的乐曲,由()主奏,()作曲。
情报部门截获恐怖分子发送的三条密码信息,经密码破译员分析,“AlingoitsDoximayo:Makasey”意思是“绑架学生(做)人质”,而“HuholikasoMakaseyMugbudengs”意思是“押着人质(见)记者”,“Mugbuden
2016年是中国共产党诞生95周年。中国产生了共产党,这是开天辟地的大事变。这一开天辟地的大事变,深刻改变了
OnAugust15thGooglebid$12.5billionforMotorolaMobility,atroubledAmericanmakerofmobilephones.Ifthepurchasegoes
在一台正在运行的SQLServer2008中,现需使用复制数据库文件的方法将某数据库从一台服务器移动到另一台服务器。关于复制数据库文件,有下列实现方法:Ⅰ.首先从数据库服务器中分离出要复制的数据库,然后复制数据库文件Ⅱ.首先停止SQLServer
Itwouldbeinterestingtodiscoverhowmanyyoungpeoplegotouniversitywithoutanyclearideaofwhattheyaregoingtodoa
最新回复
(
0
)