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
专升本
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
2019-01-24
27
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 past 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 device 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) 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 device 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 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、a new regulation for all airlines
B、the defects of electronic devices
C、a possible cause of aircraft crashes
D、effective safety measures for air flight
答案
C
解析
考查主题。主题一般在第一段段首。如果这个题出现在中间的话,一般对应某一段的内容和主题,范围小一点,比较容易。如果是第一题或最后一题,则对应整篇文章。本文的主题是关于电磁干扰可能影响飞机安全,故选C。
转载请注明原文地址:https://kaotiyun.com/show/oAaC777K
本试题收录于:
英语题库成考专升本分类
0
英语
成考专升本
相关试题推荐
Japan’s24-hourconveniencestores,alreadystrugglingwithlaggingsalesandgrowth,maysoonfaceyetanotherthreat—movesto
Unlikemodernanimalscientists,dinosaurscientistscannotsitonahillsideandusetelescopestowatchdinosaursinorderto
Thefire______twopersons’deathaswellasthedamageofallthestore’sproperty.
Enoughsleepisimportanttohealth.Theamountofsleep【C1】______dependsontheageofthepersonandtheconditionsinwhichs
Enoughsleepisimportanttohealth.Theamountofsleep【C1】______dependsontheageofthepersonandtheconditionsinwhichs
Acomputerisamachinedesignedtoperformworkmathematicallyandtostoreandselectinformationthathasbeenfedintoit.I
Acomputerisamachinedesignedtoperformworkmathematicallyandtostoreandselectinformationthathasbeenfedintoit.I
CliffordStollranacomputersysteminBerkeley,California.Asasystemadministrator,hekeptacloseeyeontherecords.On
CliffordStollranacomputersysteminBerkeley,California.Asasystemadministrator,hekeptacloseeyeontherecords.On
随机试题
在《社会组织与经济组织理论》一书中,他最早提出一套比较完整的行政组织体系理论,因此被称为“组织理论之父”。他就是法国古典管理理论的代表——韦伯。()
Itiswidelybelievedthathighlyeducatedstudentsaremorelikelytogetagoodjob.However,atanon-campusjob【C1】______in
中耳炎的发病部位是
一座66/10kV的重要变电站,装有容量为16000kV.A的主变压器两台,采用蓄电池直流操作系统,所有断路器配电磁操作机构。控制、信号等经常性负荷为2000W,事故照明负荷为1500kW,最大一台断路器合闸电流为98A,根据设计规程,请回答下列问题。
建设工程合同纠纷的处理方式主要有()。
在中国,股权众筹属于一种风险投资补充。()
货币供给过程中()的作用最重要。
金融机构对外担保余额、境内外汇担保余额及外汇外债余额之和不得超过其自有资金的20倍。()
Thereisamarkeddifferencebetweentheeducationwhicheveryonegetsfromlivingwithothersandthedeliberateeducatingof
Britainisfacinga【C1】______riseinitsratpopulation【C2】______growingnumbersofpeopleleavefastfoodscrapsinthestreet,
最新回复
(
0
)