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 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
2019-01-24
71
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 past 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 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) 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 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.
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
第三段because后面给出了解释:因为他们不能在实验室重现这些影响,所以他们没办法知道干扰是不是有危险。所以选C。A文中没有说过,B和第二句相反,D没有提到。
转载请注明原文地址:https://kaotiyun.com/show/7NaC777K
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
Thereisacomputersystem______thecompanyisexperiencingproblems.
Unlikemodernanimalscientists,dinosaurscientistscannotsitonahillsideandusetelescopestowatchdinosaursinorderto
Enoughsleepisimportanttohealth.Theamountofsleep【C1】______dependsontheageofthepersonandtheconditionsinwhichs
Enoughsleepisimportanttohealth.Theamountofsleep【C1】______dependsontheageofthepersonandtheconditionsinwhichs
Acomputerisamachinedesignedtoperformworkmathematicallyandtostoreandselectinformationthathasbeenfedintoit.I
Acomputerisamachinedesignedtoperformworkmathematicallyandtostoreandselectinformationthathasbeenfedintoit.I
Acomputerisamachinedesignedtoperformworkmathematicallyandtostoreandselectinformationthathasbeenfedintoit.I
Computersmayonedayturnnightintoday—withgoodold,naturalsunlight.Colossalcomputer-controlledmirrors,thousandso
CliffordStollranacomputersysteminBerkeley,California.Asasystemadministrator,hekeptacloseeyeontherecords.On
随机试题
举升机按照功能和形状可分为,单柱、双柱、四柱、()。
入汤剂宜后下的药物是
治疗胃脘疼痛隐隐,喜按喜暖,兼见泛吐清水,便溏,手足不温,舌淡苔薄,脉虚弱,在足三里、内关、中脘基础上,应加取()
环卫工人马某在垃圾桶内发现一名刚出生的婴儿后向公安机关报案,公安机关紧急将婴儿送医院成功抢救后未予立案。关于本案的立案程序,下列哪一选项是正确的?
配送路线优化是()。
求助者:我近来每天晚上都睡不好,白天上班头昏沉沉的,我是不是有什么问题啊?心理咨询师:是吗?我们这儿有十几个心理量表,可以测一下,就能知道你有什么问题了。求助者:行。心理咨询师:那我们先做一个瑞文测验,然后再做SDS和SCL-90,
近年来兴起的“慕课”(MOOC)是指()。
构建社会主义和谐社会的重点是()。
解决网络中信息传送的源结点用户与目的结点用户身份真实性问题的功能称为()。
TheDifferencesBetweenAmericanandBritishEnglishI.IntroductionAmericanEnglishandBritishEnglish:two【T1】______ofEngli
最新回复
(
0
)