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
考研
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
2015-06-11
33
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.
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
B
解析
依据文章第一段第四行可推断。
转载请注明原文地址:https://kaotiyun.com/show/yEQi777K
0
在职申硕(同等学力)英语
相关试题推荐
Insteadofansweringthequestion,themanager______hisshouldersasifitwerenotimportant.
IntheUSA,85%ofthepopulationovertheageof21approveofthedeathpenalty.Inthemanystateswhichstillhavethedeath
Thisbookisa______ofradioscripts,inwhichweseektoexplainhowthewordsandexpressionsbecomeapartofourlanguage.
Computerswillflourishbecausetheyenableustoaccomplishtasksthatcouldneverbeforehavebeenundertaken.
Mrs.Smith______tearswhensheheardherdaughterhaddiedintheroadaccident.
Accordingtothepassage,thecurrentemergencyinMexicoCityrefersto______.Theword"hawk"(Paragraph3)mostprobablymea
Thecostofhealthcareandhealthinsuranceremainsthemosturgenthealthproblemfacingthecountrytoday.
Averyimportantworldproblemistheincreasingnumberofpeoplewhoactuallyinhabitthisplanet.Thelimitedamountoflanda
Man:Youknowwhat?Youshouldinvestthemoneyyourself.Woman:Thathadcrossedmymind.Question:Whatdoesthewomanmean?
随机试题
对尿失禁病人的护理中哪项是错误的( )
增加击实功,可提高土的最大干密度。()
主生产计划列出()在计划期内不同时间段的需求量。
下列各句中,没有语病的一句是()。
我国古代教育家苟子说“蓬生麻中,不扶自直;白沙在涅,与之俱黑”,这强调的是()因素对人的潜移默化的作用。
时间:速度
有黑、白棋子共300枚,按每堆3枚分成100堆,其中只有1枚白子的共27堆,有2枚或3枚黑子的共42堆,有3枚白子的与有3枚黑子的堆数相等,那么全部棋子中,白子共有多少枚?
西安事变中,蒋介石最终接受停止内战,联共抗日的主张,其主要原因是()。
A、 B、 C、 D、 B
某国商业银行体系共持有准备金300亿元,公众持有的通货数量为100亿元。中央银行对活期存款和非个人定期存款规定的法定准备率分别为15%和10%,据测算,流通中的现金漏损率为25%,商业银行的超额准备率为5%,而非个人定期存款比率为50%。试求:活期存款乘数
最新回复
(
0
)