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 terrorist with a gun, but the man with the portable computer in bus
The biggest safety threat facing airlines today may not be a terrorist with a gun, but the man with the portable computer in bus
admin
2013-01-05
17
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 that well over 100 incidents could have been caused by electromagnetic interference. The source of this interference remains unconfirmed, but increasingly, experts are pointing the blame at portable electronic device 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. 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 device emit radiation which affects those wavelengths which aircraft use for navigation and communicatioa 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 systems 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. (275 words)
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 what wavelengths are liable to be interfered with.
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
本题属于细节归纳题。根据题干的问题,可确定本题指向第三段要点:困难之一,难以预测电磁场怎样影响导航电脑;困难之二,无法通过实验室模拟,故无从确切知道这种干扰是否危险。因此C是正确答案。
转载请注明原文地址:https://jikaoti.com/ti/bWbUFFFM
本试题收录于:
艺术硕士(艺术基础)题库专业硕士分类
0
艺术硕士(艺术基础)
专业硕士
相关试题推荐
试述影响我国货币需求的因素。
专业银行的主要种类包括()。
中国人民银行专门行使中央银行职能是在()年。
请举例说明新贸易保护主义对我国企业的影响。
普惠制的三大原则是()。
阅读下列材料后分析文化对企业跨国经营活动的影响。某客人在餐厅要一杯啤酒,突然发现杯中有一只苍蝇。法国人:将杯中物倾倒一空;西班牙人:留下钞票不声不响离去;日本人:将餐厅经理训斥一番;英国人:以绅士态度吩咐侍者:“换一杯啤酒来”;沙特阿拉伯人:将啤
清代戏曲声腔发展最辉煌的成就是________的形成。
Reebokexecutivesdonotliketoheartheirstylishathleticshoescalled"footwearforyuppies(雅皮士,少壮高薪职业人士)".Theycontendth
下列剧目中,以剧中出现的物品为剧名的是()。[2012年真题]
随机试题
成人静脉补钾时,要求尿量至少应超过【】
Seeingherfathercomeback,______.
A、醋酸可的松微晶25gB、氯化钠3gC、聚山梨酯801.5gD、羧甲基纤维素钠5gE、硫柳汞0.01g注射用水加至1000ml助悬剂()。
下列有关部门法的说法正确的是()。
下列关于土地登记代理机构与土地登记代理人之间的经济关系的表述,不正确的是()。
依据我国企业历史数据统计分析,一般情况下,利息备付率不宜低于()。
对客户风险承受能力准确、可靠的评估需要使用()方法
根据《刑事诉讼法》的规定,人民法院适用简易程序审理的自诉案件()。
关于享乐主义,正确的说法是()。
经济结构调整是当今世界经济发展的潮流,也是我国经济发展的内在要求。当前我国经济生活中存在的突出问题是经济结构不合理。江泽民同志多次指出,对于我国经济结构调整,早认识,早调整,就主动。认识迟,不调整,就被动。“十五”计划纲要明确指出:“‘十五’期间要坚持把经
最新回复
(
0
)