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 today may not be a terrorist with a gun, but the man with the portable computer in business cla
The biggest safety threat facing today may not be a terrorist with a gun, but the man with the portable computer in business cla
admin
2011-03-26
32
问题
The biggest safety threat facing 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 flight particularly take- off and landing. Some experts have gone further, calling for a total ban during all flights. (76)
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 all aircraft’s computers. (77)
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 (易受捐的) to interference raises the risk that terrorists may use radio systems in order to damage navigation equipment. (78)
As worrying, though, is the passenger who can’t hear the instructions to turn off his radio because the music’s too loud.
Why is it difficult to predict the possible effects of electromagnetic fields on an airplane’s computers?
选项
A、Because it remains a mystery what wavelengths are liable to be interfered with.
B、Because it is extremely dangerous to conduct such research on an airplane.
C、Because research 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
见文章第3段的内容。第3段的第3句就回答了这个问题,因此答案是选项C。
转载请注明原文地址:https://kaotiyun.com/show/H1qC777K
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
阅读陶渊明《饮酒》(其五),然后回答下列问题。结庐在人境,而无车马喧。问君何能尔?心远地自偏。采菊东篱下,悠然见南山。山气日夕佳,飞鸟相与还。此中有真意,欲辨已忘言。分析这首诗写景句子所表现出来的思想感情。
Forthispart,youaresupposedtowritealetterof100-120wordsbasedonthefollowingsituation.Remembertowriteitclearl
Theheadmasteroftheschoolhadthesupportofa______numberofparents.
Researchuniversitieshavetokeepupwiththelatestcomputerandscientifichardware______price.
WhichofthefollowingstatementsisTRUE,accordingtotheauthor?Consideredjudgmentisdifferentfrompersonalpreferencei
Thousandsofpeopleinthecity______towelcomethevisitingguests.
MostradioandtelevisionstationsintheUnitedStatesarecommercialstations,thatistosay,theyearntheirmoneyfrom【B1】
Theforeignersonce______theirproductstoourcompanyata______higherprice.
随机试题
储气罐高压表下限为()KPa。
有关计算烧伤患者热能需要量时,下列说法不正确的是
A.病邪入里B.寒邪化热C.邪退正复D.热退津复E.湿热留恋舌苔由薄白转为白厚,提示()
分类账簿按反映内容的______不同,分为总分类账和明细分类账。
儿童在周岁时只会咿呀学语,到三四岁时多半说话流畅了,这说明年龄决定儿童的心理发展。()
一、注意事项1.申论考试,与传统作文考试不同,是对分析驾驭材料的能力与对表达能力并重的考试。2.作答参考时限:阅读资料40分钟,作答110分钟。3.仔细阅读给定的资料,按照后面提出的“申论要求”依次作答。二、给定材料1.国家助学
A.Nokiaposts$1.38bnlossinthefourthqtrB.Goldsurgesto7-weekhighof$1,720C.R-PowerropesinGermanutilit
甲在缓刑考验期内犯罪,但在缓刑考验期满后才被发现,且未过追诉时效,对甲的处理应该是()。
有如下类定义:classCup{public:voidSetPrice(doubleval=5.8);doubleGetPrice(){returnprice;
「まどしめましょうか。」「いいえ、あついから________いいですよ。」
最新回复
(
0
)