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
39
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.
Few airlines want to impose a total ban on their passengers using electronic devices because ______.
选项
A、they have other effective safety measures to fall back on
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 don’t believe there is such a danger as radio interference
答案
B
解析
电磁干扰的有害作用还有待于证明。显然,如果电磁干扰的有害作用是确定无疑的,毫无疑问航空公司会彻底禁止飞机上的电子设备的使用。
转载请注明原文地址:https://jikaoti.com/ti/ztdsFFFM
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
Theexpression"lettingitallhangout"means"______."Theauthorsuggeststhatweshould______.
Ithasalwaysbeenaproblemtodecidewhether"popularmusic"ismusicwhichrepresentsthepeopleorissimplymusicthatthe
Thefollowingchartshowsthepercentageofthestudentsthatwereenrolledincolleges,universitiesandotherinstitutionsof
Idon’tknowhowIbecameawriter,butIthinkitwasbecauseofacertainforceinmethathadtowriteandthatfinallyburst
Theevolutionofartificialintelligenceisnowproceedingsorapidlythat【C1】______theendofthecenturycheapcomputers【C2】
Theevolutionofartificialintelligenceisnowproceedingsorapidlythat【C1】______theendofthecenturycheapcomputers【C2】
Theevolutionofartificialintelligenceisnowproceedingsorapidlythat【C1】______theendofthecenturycheapcomputers【C2】
Ifyouwanttostayyoung,sitdownandhaveagoodthink.ThisistheresearchfindingofateamofJapanesedoctors,whosayt
AspeciallabattheUniversityofChicagoisbusyonly【C1】______.Itisadream【C2】______whereresearchersareatwork【C3】___
JackEverytimeyouraiseahot-buttonissue,suchasthein-lawsormoney,doesyourhusbandsuddenlyclamup?Takeheart,m
随机试题
对处于充油电气设备(如高压电流、电压互感器)附近的电缆,应埋地、穿管敷设。()
Johnwokeupinthemiddleofthenightandsawsomethingwhite【21】hisgarden.Itseemed【22】towardsthehouse."That【23】ath
人参与黄芪功效的共同点,下列哪项是错误的
右侧卵巢静脉汇入
多发性骨髓瘤的表现,哪项是错误的?()
下列关于对于查询人员的要求的表述,正确的是()。
下列支出可以列入产品成本的是( )。
设,B是3阶非零矩阵,且AB=O,则Ax=0的通解是_______.
TaskOne-Aim•Forquestions13-17,matchtheextractswiththeaims,listedA-H.•Foreachextract,choosetheaimofthewo
ArecentstudybytheCenterforEconomicPolicyResearchsaysthat,inordertoeaseimbalances,theEuropeanUnionneedstoma
最新回复
(
0
)