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
88
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______."Self-preservation"(Line5,Para.5)means______.
Awebcamisadigitalcamerathatsendsvideoimagestoothercomputerusers.It’saboutthe【C1】______ofagolfballandtyp
Theostrich,thelargestbirdintheworldatpresent,livesinthedrierregionsofAfricaoutsidetheactualdeserts.Because
Bythetimewehadcompletedourpreparations,theskywasbeginningtogrowrapidlylighter,althoughthesunwasnotyetabove
Whatdoesthedoctorsuggestthemanshoulddo?
Idon’tknowhowIbecameawriter,butIthinkitwasbecauseofacertainforceinmethathadtowriteandthatfinallyburst
Theevolutionofartificialintelligenceisnowproceedingsorapidlythat【C1】______theendofthecenturycheapcomputers【C2】
Daltonwonderedwhytheheavierandlightergasesintheatmospheredidnotseparateasoilandwaterdo.Hefinallyconcludedt
Ifyouwanttostayyoung,sitdownandhaveagoodthink.ThisistheresearchfindingofateamofJapanesedoctors,whosayt
Thelongyearsoffoodshortageinthiscountryhassuddenlygivenwaytoapparentabundance.Storesandshopsarechokedwithf
随机试题
A、ThemanalreadyhasplansforSundaynight.B、Thewomanshoulddecidewheretoeat.C、Thewomanshouldaskherbrotherforas
为了测定小儿麻痹症后遗症患者的臀中肌肌力,下列哪项试验是最正确的
患者女性,52岁,二尖瓣关闭不全病史15年,近日出现心悸,胸闷,行PDE检查显示重度二尖瓣反流。该患者心脏杂音的特点是
关于桥梁振型测定试验,以下描述正确的有()。
制定工程项目计划的主要步骤,其先后顺序是()。(1)把工程项目范围详细划分为各个工作包(2)进行资源消耗和评审(3)清晰地定义工程项目目标(4)确定质量检查评审的关键节点和质量检查
实现会计电算化后,会计数据的处理流程依旧和手工会计核算基本相同。()
企业销售商品时,销售收入确认的条件包括()。
甲区位于某市东南部,辖区面积210.22平方公里,共辖8个街道,户籍人口39.5万,登记外来人口42.5万。甲区公安分局情报中心对一周警情(2017年7月14日14时至7月21日14时)进行了统计分析。本周共接有效警情1591起,环比上升0.76%。其中,
我国横断山脉是具有国际意义生物多样性的关键地区,横亘()。
下列著作按照出现的先后顺序排列正确的是()。
最新回复
(
0
)