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
考研
The biggest safety threat facing airlines today may not be a man with a gun, but the man with the portable computer in business
The biggest safety threat facing airlines today may not be a man with a gun, but the man with the portable computer in business
admin
2019-05-26
43
问题
The biggest safety threat facing airlines today may not be a man with a gun, but the man with the portable computer in business class. In the last 15 years, pilots have reposed well over 100 incidents that could have been caused by electromagnetic interference(电磁波干扰). The source of this interference remains a mystery, but increasingly, experts are pointing the blame at potable electronic devices such as portable computers, radio and mobile telephones.
RTCA, an organization which advises the aviation(航空)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. 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 predicting how electromagnetic fields might affect an aircraft’ s computers. Experts know that portable devices give out radiation that affects navigation and communication of aircraft. 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.
Why is it difficult to predict the possible effects of electromagnetic fields on an airplane’ s computers?
选项
A、Because it is extremely dangerous to conduct such research on an airplane.
B、Because it remains a mystery which part of an airplane is easy to be interfered with.
C、Because research scientists have not been to produce the same effects in labs.
D、Because experts lack adequate equipment to do such research.
答案
C
解析
由第三段最后一句“because they have not been able to reproduce these effects in a labora—tory”可知应选C。
转载请注明原文地址:https://kaotiyun.com/show/Y1nZ777K
0
考研英语一
相关试题推荐
It’seasytoscarepeopleaboutwhat’sintheirfood,butthedangerisalmostneverreal.Andthe【C1】______itselfkills.Ta
Isanti-whitebiasaproblem?Anewstudysayswhitesthinkdiscriminationagainstthemisabiggerproblemthananti-blackbias
PresidentBarackObamaclaimedprogressWednesdayinhissecond-termdrivetocombatclimatechangebutsaidmoremustbedonet
PresidentBarackObamaclaimedprogressWednesdayinhissecond-termdrivetocombatclimatechangebutsaidmoremustbedonet
Atschoolwewentoveroursocialnetworkingguidelines.【C1】______theobvious—don’tbeinappropriatewithstudentsthroughtexti
Whenshopkeeperswanttolurecustomersintobuyingaparticularproduct,theytypicallyofferitatadiscount.Accordingtoa
TheEarth’sdailyclock,measuredinasinglerevolution,istwenty-fourhours.Thehumanclock,【B1】______,isactuallyabout
WholesalepricesinJulyrosemoresharplythanexpectedandatafasterratethanconsumerprices,【C1】______thatbusinesseswe
Somehousesaredesignedtobesmart.Othershavesmartdesigns.AnexampleofthesecondtypeofhousewonanAwardofExcellen
Weoftentendtoassociatesmilingastheresultofapositiveeventormood.Butresearchdemonstratesthattheactofsmiling,
随机试题
学位
我国铁路联运货物运输费用是按()计算
()依法对期货公司及其从业人员从事期货投资咨询业务实行监督管理。
根据刑事法律制度的规定,下列各项中,有期徒刑的期限是()。
我国公布的首家全国农业旅游示范点有()。
教育方针通常由政府或政党提出,对教育实践具有强制性。()
广州战略性新兴产业的产品有的是按国家标准生产,尚未与国际标准___________,与国际同类相关产品技术不___________,导致这些产品只能销往国内市场。填入画横线部分最恰当的一项是()。
学校食堂里,肉类有鸡肉、猪肉、牛肉、羊肉、鱼肉;蛋类有鸡蛋、咸鸭蛋、鹅蛋、松花蛋;蔬菜有白菜、菠菜、花菜。小华每天中午都去食堂吃饭,都点三个不同的菜,其中至少包括肉类、蛋类、蔬菜中的两种,问至少经过多少天,可以确定小华有两天点的菜完全相同?
设函数f(x)任点x=a处可导,则函数丨f(x)丨在点x=a处不可导的允分条件是
A、态度非常生气B、态度非常强硬C、态度非常坚决D、说话声音太大C
最新回复
(
0
)