首页
登录
职称英语
You never see them, but they’re with you every time you fly. They record whe
You never see them, but they’re with you every time you fly. They record whe
游客
2024-02-09
5
管理
问题
You never see them, but they’re with you every time you fly. They record where you are going, how fast you’re traveling and whether everything on your airplane is functioning normally. Their ability to withstand almost any disaster makes them seem like something out of a comic book. They’re known as the black box.
When planes fall from the sky, as a Yemeni airliner did on its way to Comoros Islands in the India ocean June 30, 2009, the black box is the best bet for identifying what went wrong. So when a French submarine(潜水艇)detected the device’s homing signal five days later, the discovery marked a huge step toward determining the cause of a tragedy in which 152 passengers were killed.
In 1958, Australian scientist David Warren developed a flight-memory recorder that would track basic information like altitude and direction. That was the first mode for a black box, which became a requirement on all U.S. commercial flights by 1960. Early models often failed to withstand crashes, however, so in 1965 the device was completely redesigned and moved to the rear of the plane - the area least subject to impact - from its original position in the landing wells(起落架舱). The same year, the Federal Aviation Authority required that the boxes, which were never actually black, be painted orange or yellow to aid visibility.
Modern airplanes have two black boxes: a voice recorder, which tracks pilots’ conversations, and a flight-data recorder, which monitors fuel levels, engine noises and other operating functions that help investigators reconstruct the aircraft’s final moments. Placed in an insulated(隔绝的)case and surrounded by a quarter-inch-thick panels of stainless steel, the boxes can withstand massive force and temperatures up to 2,000℉. When submerged, they’re also able to emit signals from depths of 20,000 ft. Experts believe the boxes from Air France Flight 447, which crashed near Brazil on June 1, 2009, are in water nearly that deep, but statistics say they’re still likely to turn up. In the approximately 20 deep-sea crashes over the past 30 years, only one plane’s black boxes were never recovered. [br] Why was the black box redesigned in 1965?
选项
A、New materials became available by that time.
B、Too much space was needed for its installation.
C、The early models often got damaged in the crash.
D、The early models didn’t provide the needed data.
答案
C
解析
推理题。从第三段第三句可得出,之前的黑匣子在飞机坠毁时经不住强烈的撞击,容易遭受毁坏,因此1965年人们重新改造了黑匣子。故选C。
转载请注明原文地址:https://tihaiku.com/zcyy/3434158.html
相关试题推荐
TheArtofPublicSpeakingIfyouweretotape-recordon
TheArtofPublicSpeakingIfyouweretotape-recordon
TheArtofPublicSpeakingIfyouweretotape-recordon
TheArtofPublicSpeakingIfyouweretotape-recordon
TheArtofPublicSpeakingIfyouweretotape-recordon
Fewhumanrecordssurviveforlong,the16000-year-oldPaleolithiccavepai
Fewhumanrecordssurviveforlong,the16000-year-oldPaleolithiccavepai
Amidasummerofrecord-settingheat,anewsurveyfindsthatmostofGenera
Amidasummerofrecord-settingheat,anewsurveyfindsthatmostofGenera
Amidasummerofrecord-settingheat,anewsurveyfindsthatmostofGenera
随机试题
Theappealofadvertisingtobuyingmotivescanhaveboth【B1】______andposi
毛泽东明确指出“使马克思主义在中国具体化”任务的会议是()A.遵义会议 B.
心肌等长自身调节是通过改变下列哪一项而实现的()A.心室舒张末期压力 B.
能祛风解表,炒炭又可止血的药物是()A.羌活 B.白芷 C.桂枝 D
根据材料,除印度外,我国对主要国家和地区货物进出口总额增长率最高的国家(地区)的
各种运输方式内外部的各个方面的构成和联系,就是( )。 A.运输系统
经营活动,是指企业投资活动和筹资活动以外的所有交易和事项,包括()等。A.销售商
在《城市道路交通规划设计规范》中规定,城市道路交通发展战略规划包括城市道路交通发
按内容可将记账凭证分为()。A.收款凭证 B.付款凭证 C.复式记账凭
(2020年真题)在绘制单位工程施工进度计划图前,需要完成的先导工作有( )。A
最新回复
(
0
)