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 busi
The biggest safety threat facing airlines today may not be a terrorist with a gun,but the man with the portable computer in busi
admin
2013-01-20
69
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.
What is said about the over 100 aircraft incidents in the past 15 years?
选项
A、They may have been caused by the damage to the radio systems.
B、They may have taken place during take-off and landing.
C、They were proved to have been caused by the passengers’ portable computers.
D、They were suspected to have resulted from electromagnetic interference.
答案
D
解析
参见文章第一段第二至第三行。
转载请注明原文地址:https://jikaoti.com/ti/sE8YFFFM
0
考博英语
相关试题推荐
Ourjourneywasslowbecausethetrainstopped______atdifferentvillages.
Thepeoplefortheexperimentwerechosencompletely______.
Thethreementriedmanytimestosneakacrosstheborderintotheneighbouringcountry,______bythepoliceeachtime.
Outputisnowsixtimes______itwasbeforeliberation.
IntheUnitedStatesandinmanyothercountriesaroundtheworld,therearefourmainwaysforpeopletobe【1】aboutdevelopment
Ifitwereonlynecessarytodecidewhethertoteachelementarysciencetoeverycneonamassbasisortofindthegiftedfewa
Thereareover6,000differentcomputerandonlinegamesintheworldnow.Asegmentofthemareconsideredtobebotheducation
The1982oilandGasActgivespowertopermitthedisposalofassetsheldbytheCorporation,and_______theCorporation’sstat
TheEuropeanCommissionissueda_____decisiononOct.29permittinganalliancebetweenUnitedAirlines,DeutscheLufthansaandS
随机试题
一种药物能减轻另一种药物的毒烈性,这种配伍关系是()
引起药物不良反应的机体方面原因是
下列工资收入属于国民收入初次分配的是()。
该施工企业是否具备承建A工程的资质等级要求?为什么?该施工企业是否可以选派B工程的项目经理担任A工程项目经理?请说明理由。
下列属于建筑施工企业现场综合考评内容的是()。
不利于提高混凝土耐久性的方法是()。
根据我国《民法通则》的规定,委托书授权不明的,()。
2012年1—4月份,民间固定资产投资46869亿元,比上年同期增长27.3%,增速较1—3月份回落1.6个百分点,比同期固定资产投资(不含农户)增速高7.1个百分点。民间固定资产投资占固定资产投资的比重为62%,比1—3月份提高0.1个百分点。
鸳∶鸯()
ScientistssaidThursdaythatanewAIDSvaccine,thefirsteverdeclaredtoprotectasignificantminorityofhumansagainstth
最新回复
(
0
)