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
2013-01-25
71
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 bah during all flights. Currently, rules on using these devices are left up to individual airlines. And although some airlines prohibit passengers from using such e-quipment 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.
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 to produce the same effects in labs.
D、Because experts lack adequate equipment to do such research.
答案
C
解析
依据是第三段第4行。
转载请注明原文地址:https://kaotiyun.com/show/cF1O777K
0
考博英语
相关试题推荐
Asadevelopingcountry,wemustkeep_____withtherapiddevelopmentoftheworldeconomy.
Writeanessayonthegiventopic,OnunrestrainedConsumption.Basedonthefollowingoutline,presentyourargumentwithsuppo
Manyeconomistsbelievedthat_____consumerswouldcutspendingoncethevalueoftheirhomesbegantofall.
In1784,fiveyearsbeforehebecamepresidentoftheUnitedStates,GeorgeWashington,52,wasnearlytoothless.Sohehireda
ThismonthSingaporepassedabillthatwouldgivelegalteethtothemoralobligationtosupportone’sparents.CalledtheMai
Dogsaresocialanimalsandwithoutpropertraining,theywillbehavelikewildanimals.Theywillspoilyourhouse,destroyyo
Someworkersinthenuclearpowerstationwereexposedtohighlevelsof_____.
Readthefollowingparagraphandthenwritearesponsepaperofabout250to300words.WriteitneatlyonANSWERSHEET(2).
Ihavehadjustaboutenoughofbeingtreatedlikeasecond-classcitizen,simplybecauseIhappentobethatput-uponmemberof
随机试题
患者,女,65岁。有糖尿病病史3年。造成该患者糖尿病最重要的因素是
A.头孢哌酮B.链霉素C.氯霉素D.红霉素E.四环素属于大环内酯类抗菌药物的是()。
20.2007年,张某请风水先生选了块墓地安葬亡父,下葬时却挖到十年前安葬的刘某父亲的棺木,张某将该棺木锯下一角,紧贴着安葬了自己父亲。后刘某发觉,以故意损害他人财物为由起诉张某,要求赔偿损失以及精神损害赔偿。对于此案,合议庭意见不一。法官甲认为,下葬棺木
股票市场就是股票发行和交易的场所,由()两个层次构成。
银行要求咨询工程师(投资)不受()的影响,提出客观公正的报告。
以下关于建设工程企业资质等级划分的表述中,正确的有()。
甲公司是一家传统燃油汽车生产企业,随着环境保护呼声越来越高以及国家政策的支持,燃气汽车越来越受欢迎,燃气汽车的兴起对于甲公司来说属于五种竞争力分析中的()。
软件工程的结构化分析方法具有基本特征,在下列可选内容中,(56)不具有其特征。
TheCaseoftheDisappearingFingerprintsOneusefulanti-cancerdrugcaneffectivelyerasethewhorls(萝状指纹)andothercharact
A、 B、 C、 C
最新回复
(
0
)