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
专升本
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
2019-01-24
73
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 past 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 device 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) 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 device 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. 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
C
解析
关键句在第二段最后一句,given that many passengers want to work during flights.很多乘客要在飞行期间工作,可以推断一些航空公司拒绝禁令的原因是:如果他们推行了禁令,也许许多需要在飞机上工作的乘客就不会选择乘坐飞机了。故选C。
转载请注明原文地址:https://www.kaotiyun.com/show/zAaC777K
本试题收录于:
英语题库成考专升本分类
0
英语
成考专升本
相关试题推荐
Japan’s24-hourconveniencestores,alreadystrugglingwithlaggingsalesandgrowth,maysoonfaceyetanotherthreat—movesto
Enoughsleepisimportanttohealth.Theamountofsleep【C1】______dependsontheageofthepersonandtheconditionsinwhichs
Enoughsleepisimportanttohealth.Theamountofsleep【C1】______dependsontheageofthepersonandtheconditionsinwhichs
Enoughsleepisimportanttohealth.Theamountofsleep【C1】______dependsontheageofthepersonandtheconditionsinwhichs
Acomputerisamachinedesignedtoperformworkmathematicallyandtostoreandselectinformationthathasbeenfedintoit.I
Computersmayonedayturnnightintoday—withgoodold,naturalsunlight.Colossalcomputer-controlledmirrors,thousandso
Computersmayonedayturnnightintoday—withgoodold,naturalsunlight.Colossalcomputer-controlledmirrors,thousandso
Computersmayonedayturnnightintoday—withgoodold,naturalsunlight.Colossalcomputer-controlledmirrors,thousandso
CliffordStollranacomputersysteminBerkeley,California.Asasystemadministrator,hekeptacloseeyeontherecords.On
随机试题
孕妇24岁,G2P1,孕40周,破水14小时,有规律宫缩10小时,胎儿手脱出阴道口来院。检查:产妇神志清,痛苦面容。腹痛拒按,烦躁不安。脉搏、呼吸快,胎心不清,约160次/分。对该孕妇的最佳处理措施是()
A.藿香正气散加金银花、连翘B.藿香正气散加荆芥、防风C.藿香正气散去甘温之品,加黄连、佩兰、荷叶D.藿香正气散加木香、枳壳等E.藿香正气散去白术,加鸡内金、神曲外邪犯胃之呕吐,若兼脘痞嗳腐,饮食停滞,其治疗方宜
由胆固醇合成胆汁酸的限速酶是
国际上项目的分类主要以项目的()等方面为依据。
会计人员继续教育的内容包括( )。
下列不属于商用房贷款信用风险主要内容的是()。
企业登记属于()。
根据以下资料,回答下列问题。2011年上半年,我国软件产业实现软件业务收入8065亿元,同比增长29.3%,增速比去年同期高0.2个百分点;实现利润103亿元,同比增长34.9%。其中,6月份完成软件业务收入1828亿元,同比增长32.9%,增速
试述影响人的社会化的环境因素。(河北大学2012年研)
树中度为零的结点称为______。
最新回复
(
0
)