首页
登录
职称英语
[originaltext] The biggest safety threat facing airlines today may not be a te
[originaltext] The biggest safety threat facing airlines today may not be a te
游客
2023-07-14
17
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.
Radio Technical Commission for Aeronautics, or RTCA, an organization which advises the aviation industry, has recommended that all airlines ban such devices from being used during "critical" stages of a flight, particularly takeoff 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 takeoff 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.
选项
A、A terrorist with a gun.
B、A passenger with a portable computer.
C、A tired pilot.
D、A smaller airplane.
答案
B
解析
转载请注明原文地址:https://www.tihaiku.com/zcyy/2837301.html
相关试题推荐
[originaltext]StValentine’sDayiscelebratedonFebruary14ofeachyear.
[originaltext]W:John!Howareyou?It’sbeenagessincewemetlasttime!M:I
[originaltext]W:John!Howareyou?It’sbeenagessincewemetlasttime!M:I
[originaltext]W:John!Howareyou?It’sbeenagessincewemetlasttime!M:I
[originaltext]W:Ireallycan’tstandthewayDavidcontrolstheconversationa
[originaltext]W:Ireallycan’tstandthewayDavidcontrolstheconversationa
[originaltext]W:Ireallycan’tstandthewayDavidcontrolstheconversationa
[originaltext]W:Ireallycan’tstandthewayDavidcontrolstheconversationa
[originaltext]W:Ireallycan’tstandthewayDavidcontrolstheconversationa
[originaltext]Whatcanparentsofteenagersdotopreparetheirkidsforth
随机试题
A—BusinessManagementB—AccountancyandManagementInformationSystemsC—Financi
[originaltext]I’dliketosharewithyoutodaymyexperiencewithanewap
Whenitbegantorainhard,Itookinthedoorwayofabuilding.A、departureB、re
Youaredevelopingasever-sideenterpri
女性,25岁。低热,腹泻,糊样便已3年,近3月加重。查体:右下腹5cm×5cm肿
案例:阅读下面的学生习作,完成第17-18题。 扶不扶 ①摔倒的老人扶不扶,
0.25,0.25,0.5,2,16,(?) A32 B64 C128
1,4,16,49,121,()。 A.256 B.225 C.196
一般而言,专家系统在分析信用风险时主要考虑与借款人有关的因素和与市场有关的因素。
资料一瑞祥技术有限公司成立于1987年,总部位于广东省深圳市。瑞祥是全球领先的
最新回复
(
0
)