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
2024-02-15
5
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、Because it is extremely dangerous to conduct such research on an airplane.
B、Because it remains a mystery what wavelengths are liable to be interfered with.
C、Because scientists have not been able to produce the same effects in labs.
D、Because experts lack adequate equipment to do such research.
答案
C
解析
转载请注明原文地址:https://www.tihaiku.com/zcyy/3453569.html
相关试题推荐
[originaltext]ProfessionalsportsareverypopularintheUnitedStates,and
[originaltext]Whydosomanypeoplelivetoahealthyoldageincertainpa
[originaltext]Onedayafarmerboughtfourdonkeysatthemarketplaceinth
[originaltext]Onedayafarmerboughtfourdonkeysatthemarketplaceinth
[originaltext]Onedayafarmerboughtfourdonkeysatthemarketplaceinth
[originaltext]M:HiDiana,mindifIsitdown?W:Notatall,Jerry.Howhavey
[originaltext]M:HiDiana,mindifIsitdown?W:Notatall,Jerry.Howhavey
[originaltext]M:HiDiana,mindifIsitdown?W:Notatall,Jerry.Howhavey
[originaltext]Advertisingismadeupofthetechniquesandpracticesusedt
[originaltext]M:Shawn’sbeentryingformonthstofindajob.ButIwonderhow
随机试题
不可抗力造成损失时,下列应由发包人承担的是( )。A、施工机械设备损坏 B、待
小儿语言发育的3个阶段的顺序是A.模仿、理解、表达 B.发音、理解、表达 C
湿邪致病可见A.四肢困倦,胸闷呕恶 B.皮肤干涩 C.狂躁妄动 D.头身疼
股票的清算价值是公司清算时每一股份所代表的()。A.账面价值 B.资产价值
共用题干 某汽车企业生产15-8型号汽车,年产量10000台,每台15-8型号
房地产投资的方式不包括()。A:房地产购买B:房地产租赁C:房地产信托D:
制约课程改革的三大因素是()。 A.政治、经济、文化 B.社会制度、生产力
腹部闭合性损伤最常见的脏器是A.结肠 B.胰腺 C.脾 D.肾 E.肝
锥体束病理反射
单位工程竣工结算由()。A.发包人编制,承包人审查 B.承包人编制并审查 C
最新回复
(
0
)