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
2010-03-03
32
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 to 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 aircrafts 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 aircrafts may be vulnerable to interference raises the risk that terrorists may use radio systems 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.
The passage is mainly about ______.
选项
A、the defects of electronic devices
B、a new regulation for all airlines
C、effective safety measures for air flight
D、a possible cause of aircraft crashes
答案
D
解析
主旨题。本题询问文章的主要内容是什么。文章首先说明对航空公司最大的威胁来自电磁干扰。接着,文章介绍了专家的建议:尤其在飞机起降期间禁止使用这些电子设备。不同的航空公司也采取了不同对策。最后,文章指出由于飞机易受到电磁的干扰,这一点也可能被恐怖分子所利用,也可能被粗心的乘客忽视。
转载请注明原文地址:https://kaotiyun.com/show/o9lK777K
本试题收录于:
大学英语三级A级题库大学英语三级分类
0
大学英语三级A级
大学英语三级
相关试题推荐
A、10minutesonfoot.B、20minutesonfoot.C、10minutesbycar.D、20minutesbycar.A信息明示题。对话中,男士询问女士公寓距离购物中心有多远,女士回答说步行仅需要十分钟
A、Acupoftea,please.B、Yes,I’dloveto.C、You’rewelcome.D、Goodluck.B本题考查询问别人是否愿意做某件事情的一般疑问句及其回答。回答分为肯定和否定两种情况:肯定回答可以说Yes
A、Thisweekend.B、ThisMonday.C、Nextweekend.D、NextMonday.C信息明示题。对话中,男士询问女士是否会有书包的促销活动,女士给出肯定回答,并指出在下个周末开展针对所有物品的促销活动。由此可知,这
A、Hechangedhisjob.B、Hechangedhisapartment.C、Hehadagoodlandlady.D、Heisawayonbusiness.A对话中,男士说他曾经也像女士一样开几个小时车去工作
Themanager,aswellashisadvisers,______toattendtheworldfair.
Withtheintroductionofthecomputer,librariestodayarequitedifferentfrom______theywereinthepast.
FirstAidThemostimportantthingaboutfirstaidistodoonlywhatisnecessary,buttodothatascarefullyandquickly
Withoutacarmostpeoplefeelthattheyarepoor,andevenifapersonispoorhedoesn’tfeelreallypoorwhenhehasacar.
A、Teacherandstudent.B、Doctorandpatient.C、Coworkersinanoffice.D、Managerandemployee.C
Themainideaofthefirstparagraphisthat______.Theauthorbelievesthat______.
随机试题
下列适合高血压伴左心室肥厚患者的降压药是
灰质异位最佳的检查方法是
男性,28岁,胸部外伤致右侧第5肋骨骨折并发气胸,极度呼吸困难,发绀,出冷汗。体格检查:血压10.6/8kPa(80/60mmHg),气管向左侧移位,右胸廓饱满,叩诊呈鼓音,呼吸音消失,颈胸部有广泛皮下气肿等。医生采用闭式胸膜腔引流治疗。判断胸腔引流管
用于高层建筑的玻璃幕墙密封膏是以下哪种密封材料?[2008--036]
远期净敞口头寸中的远期合约包括()。
资源管理策略就是时间管理策略,只要合理安排时间,就能达到最好的学习效果。()
学生在重现有关知识时发生困难,或重现出来的知识不是解决当前课题所必需的,其原因可能有()
为什么有那么多科学家热衷于研究生物钟?他们可不光是为了发明倒时差的药物。研究表明,生物钟与人的健康状况有很大关系,现代人的生活节奏越来越快,生活方式也越来越国际化,长途飞行和“三班倒”正在成为职场的普遍现象。从这个意义上说,生物钟紊乱也许是现代人健康状况普
yy"=1+y’2满足初始条件y(0)=1,y’(0)=0的解为___________.
CultureShockA)BecauseI’velivedinChinaforalongtime,localsoftensmileandgivemethehonorabletitleofbeing"a
最新回复
(
0
)