首页
登录
职称英语
The biggest safety threat facing airlines today may not be a terrorist with
The biggest safety threat facing airlines today may not be a terrorist with
游客
2024-07-04
21
管理
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. [br] 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 it remains a mystery what wavelengths are liable to be interfered with.
C、Because research scientists have not been able to produce the same effects in labs.
D、Because experts lack adequate equipment to do such research.
答案
C
解析
细节题。就为什么难以预告飞机上的电脑可能产生的电磁干扰的原因,作者在第三段给出了答案:“because they (the experts) 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.”,可见原因应是科学家尚不能在实验室中复制这种电磁影响。
转载请注明原文地址:https://tihaiku.com/zcyy/3662541.html
相关试题推荐
The20thChinaCarpetFairwillbethebiggestofitskindinscale.Specialized
AttheinternationalterminalforNorthwestAirlinesatJohnF.KennedyInternati
Whatissomepeople’sexcusefornotwearingsafetybelts?Theysaytheyare____
Latelyyou’vebeenheatingalotofautocompaniestalkingaboutsafety.AndatF
It’sgenerallyagreedthatthegreatestthreatfacingtheworldtodayisthe
Latelyyou’vebeenhearingalotofautocompaniestalkingaboutsafety.Andat
Because[originaltext]ForwhatreasondoestheVenicefaceathreattoitsvery
What’stheproblemtheworldisnowfacing?________________________________.Th
【46】[br]【47】ontheground细节题。由题干mobilephones定位于文章Foryoursafetyandconvenie
Thebiggestsafetythreatfacingairlinestodaymaynotbeaterroristwith
随机试题
Adebatehaseruptedwithinmedicineoverhowtoensurethatphysiciansmain
中国特色社会主义理论是马克思主义中国化的最新成果,它包括()A.毛
根据《房屋建筑与装饰工程工程量计算规范》(GB/T50854-2013),打桩工
关于个人独资企业解散,下列说法正确的有( )。A.投资人自行清算的,应当在清算前
患者,男,30岁。瘿肿目突,急躁易怒,烦热多汗,面部烘热,口干口苦,多食消瘦,两
中毒性白内障是下列何种毒物中毒最常见的特征性体征A、三硝基甲苯 B、砷 C、
Thechangeinthatvillagewasmiraculou
血液的营养和滋润作用,具体可表现在( ) A.面色的红润 B.肌肉的丰满壮
( )是普遍的市场结构,也是产业组织理论重点研究的市场结构。A.寡头垄断 B
水泥体积安定性不良的原因一般是由于()。A.水泥颗粒太细 B.含水量超标
最新回复
(
0
)