首页
登录
职称英语
The biggest safety threat facing airlines today may not be a terrorist with
The biggest safety threat facing airlines today may not be a terrorist with
游客
2024-10-28
34
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.
RTCA, an organization which advises the aviation 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. 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 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 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. [br] Few airlines want to impose a total ban on their passengers using electronic devices because ______.
选项
A、they don’t believe there is such a danger as radio interference
B、the harmful effect of electromagnetic interference is yet to be proved
C、most passengers refuse to take a plane which bans the use of radio and cassette players
D、they have other effective safety measures to fall back on
答案
B
解析
A 、C 和D 在文中未提及,也无从推理出来。文章第三段指出“because they(the experts) 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",因此航空公司对禁止在飞机上使用电子设备表现出犹豫不决,由此可以推断出航空公司没有彻底禁止机上乘客使用电子设备的原
转载请注明原文地址:https://tihaiku.com/zcyy/3821261.html
相关试题推荐
ThethreebiggestliesinAmericaare:(1)"Thecheckisinthemail."(2)
ThethreebiggestliesinAmericaare:(1)"Thecheckisinthemail."(2)
Thebiggestsafetythreatfacingairlinestodaymaynotbeaterroristwith
Thebiggestsafetythreatfacingairlinestodaymaynotbeaterroristwith
Thebiggestsafetythreatfacingairlinestodaymaynotbeaterroristwith
Thebiggestsafetythreatfacingairlinestodaymaynotbeaterroristwith
Thebiggestsafetythreatfacingairlinestodaymaynotbeaterroristwith
WhatplaguearesomeAfricancountriesfacing?[br][originaltext]AUnited
WhatplaguearesomeAfricancountriesfacing?[originaltext]AUnitedNatio
Manyofthemostdamagingandlifethreateningtypesofweathertorrential
随机试题
BiologicalPestControlBiologicalcontrolis,generally,
[originaltext]Hello,I’mSteveEmber.TodaywetellaboutamanknownasJo
平面尺寸较大的建筑门厅常采用()。A.现浇钢筋混凝土板式楼板 B.预制钢
能破血行气,消积止痛的药物组是A.桃仁、红花B.莪术、三棱C.乳香、没药D.牛膝
根据《公开地图内容表示若干规定》,中国全图必须表示南海诸岛、钓鱼岛、赤尾屿等重要
下列哪个不是非共价键破坏造成的蛋白质不稳定性A、聚集 B、水解 C、宏观沉淀
引起细菌性扁桃体炎最多见的病原体是A.溶血性链球菌 B.流感嗜血杆菌 C.肺
糖异生途径的关键酶是 A.磷酸甘油酸激酶B.烯醇化酶C.丙酮酸激酶 D.丙酮
下列关于流水施工的说法中,反映建设工程非节奏流水施工特点的有()A、专业工作队数
根据《特种设备安全监察条例》的规定,大型游乐设施的运营使用单位,应当将()和警示
最新回复
(
0
)