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
2011-03-01
80
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 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 to interference raises the risk that terrorists may use radio systems in order to damage navigation equipment. As a result, loud music sound makes the passenger unable to hear the instructions turning off his radio, this is the most worrying things to airlines.
The passage is mainly about ______.
选项
A、a possible cause of aircraft crashes
B、a new regulation for all airlines
C、effective safety measures for air flight
D、the defects of electronic devices
答案
A
解析
本文第一段和第二段可看出答案。
转载请注明原文地址:https://kaotiyun.com/show/jAkd777K
本试题收录于:
公共英语三级笔试题库公共英语(PETS)分类
0
公共英语三级笔试
公共英语(PETS)
相关试题推荐
Inthefuturecomputerswilltendtobemade______.Accordingtothetext,theemotionalcomputer______.
Theexpression"lettingitallhangout"means"______."Theauthorsuggeststhatweshould______.
Ithasalwaysbeenaproblemtodecidewhether"popularmusic"ismusicwhichrepresentsthepeopleorissimplymusicthatthe
Ithasalwaysbeenaproblemtodecidewhether"popularmusic"ismusicwhichrepresentsthepeopleorissimplymusicthatthe
Whatdoesthedoctorsuggestthemanshoulddo?
Idon’tknowhowIbecameawriter,butIthinkitwasbecauseofacertainforceinmethathadtowriteandthatfinallyburst
Ifyouwanttostayyoung,sitdownandhaveagoodthink.ThisistheresearchfindingofateamofJapanesedoctors,whosayt
Ifyouwanttostayyoung,sitdownandhaveagoodthink.ThisistheresearchfindingofateamofJapanesedoctors,whosayt
ForanincreasingnumberofstudentsatAmericanuniversities,Oldissuddenlyin.Thereasonisobvious:thegrayingofAmerica
JackEverytimeyouraiseahot-buttonissue,suchasthein-lawsormoney,doesyourhusbandsuddenlyclamup?Takeheart,m
随机试题
下列细胞中,哪项不属于弥散神经内分泌系统()
下列选项中,不属于审计报告意见类型的是()
误服生半夏中毒,应考虑选用下列哪项解毒
国家提倡自愿献血的健康公民是
两样本均数比较的t检验,差别有统计学意义时,P越小,说明()
国有企事业法人单位向其他企业投资所形成的股份称为法人股。()
当电视机图像出现“网纹”故障时,应属于以下哪一指标出现问题?()
工程合同的付款分()。
在SQLServer2008中,设有商品表(商品号,商品名,生产日期,单价,类别)。现经常需要执行下列查询:SELECT商品号,商品名,单价FROM商品表WHERE类别IN(’食品’,’家电’)ORDERBY商品号现需要在商品表上建立合适的索
A、Thewomanlikesworkingonherown.B、Thewomanlikesworkingwithothers.C、Thewomanisawell-experienced.D、Themanageris
最新回复
(
0
)