首页
登录
职称英语
The biggest safety threat facing airlines today may not be a terrorist with
The biggest safety threat facing airlines today may not be a terrorist with
游客
2025-04-24
25
管理
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 (航空) industry,has recommended that all airlines ban (禁止) such devices from being used during "critical" stages of light,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 (易受损的) to interference raises the risk that terrorists may use radio system 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. [br] What is said about the over 100 aircraft incidents in the past 15 years?
选项
A、They may have been caused by the damage to the radio systems.
B、They may have taken place during take-off and landing.
C、They were proved to have been caused by the passengers’ portable computers.
D、They were suspected to have resulted from electromagnetic interference.
答案
D
解析
参见文章第一段第二至第三行。
转载请注明原文地址:https://tihaiku.com/zcyy/4051306.html
相关试题推荐
Thebiggestsafetythreatfacingairlinestodaymaynotbeaterroristwith
Thebiggestsafetythreatfacingairlinestodaymaynotbeaterroristwith
Thebiggestsafetythreatfacingairlinestodaymaynotbeaterroristwith
Thebiggestsafetythreatfacingairlinestodaymaynotbeaterroristwith
Thebiggestsafetythreatfacingairlinestodaymaynotbeaterroristwith
Aserioustransportationcrisisisfacingdevelopingcountriesinwhichrapidly
Seariseasaconsequenceofglobalwarmingwouldimmediatelythreatenthat
Seariseasaconsequenceofglobalwarmingwouldimmediatelythreatenthat
Seariseasaconsequenceofglobalwarmingwouldimmediatelythreatenthat
Seariseasaconsequenceofglobalwarmingwouldimmediatelythreatenthat
随机试题
Nancyhad(agreatdealof)trouble(toconcentrateon)herwork(becauseof)th
Americans’ParadoxicalBehaviorOneofthegeneralitiesmostoftenn
WhenPhoebeawoke,whichshedidwiththeearlytwitteringoftheconjugalc
AsachildIwastaughttowalkwithmyheadup,my【C1】______backandmye
下列各项中,资源税减征30%的有()。A、三次采油资源税 B、深水油气田资源
上市公司、股票在国务院批准的其他全国性证券交易场所交易的公司持有百分之五以上股份
在存量房买卖业务交易撮合中,房地产经纪人需要处理的关键问题是( )。A.磋商交
第七次全国人口普查是我国人口发展进入关键期开展的一次重大国情国力调查。作为此次普
钨极惰性气体保护焊自由的特点有()A.电弧热量集中,可精确控制焊接热输入,焊接
对于地基基础设计等级为甲级或地质条件复杂,应采用静载试验的方法进行检验,检验桩数
最新回复
(
0
)