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
You never see him, but they’re with you every time you fly. They record where you are going, how fast you’re traveling and wheth
You never see him, but they’re with you every time you fly. They record where you are going, how fast you’re traveling and wheth
admin
2016-03-05
56
问题
You never see him, 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 Indian ocean on 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 quarter-inch-thick panels of stainless steel, the boxes can withstand massive force and temperatures up to 2000℉. When submerged, they’re also able to emit signals from depths of 20000 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.
What do we know about the black boxes from Air France Flight 447?
选项
A、There is still a good chance of their being recovered.
B、There is an urgent need for them to be reconstructed.
C、They have stopped sending homing signals.
D、They were destroyed somewhere near Brazil.
答案
A
解析
根据第四段倒数第四行Experts believe the boxes from Air France Flight 447,whichcrashed near Brazil on June 1,2009,are in water nearly that deep,but statistics say they’re stilllikely to turn up.可知专家仍然相信,2009年在巴西坠毁的飞机,其黑匣子还是有可能找到的,虽然该黑匣子可能已经接近极限了。
转载请注明原文地址:https://kaotiyun.com/show/rCHC777K
本试题收录于:
英语题库普高专升本分类
0
英语
普高专升本
相关试题推荐
Workaholism(工作狂)canbeaseriousproblem.Trueworkaholics(工作狂)wouldratherworkthandoanythingelseandtheyprobablydon’t
Weknowthekissasaformofexpressingaffection(爱情).Butlongbeforeitbecame【C1】______,itwasthecustominmanypartsof
Herearesomesuggestionsthatprovehelpfulforthosewhoarepreparingforajobinterview.Insomeway,a(n)【B1】______intervi
ThetraditionalAmericanThanksgivingDaycelebrationgoesbackto1621.InthatyearaspecialfeastwaspreparedinPlymouth,
Tomanypeoplewholivehereandtothemillionswhovisiteachyear,SanFranciscoisajewelofAmericancitiesforitsbeauty
Tomanypeoplewholivehereandtothemillionswhovisiteachyear,SanFranciscoisajewelofAmericancitiesforitsbeauty
Tomanypeoplewholivehereandtothemillionswhovisiteachyear,SanFranciscoisajewelofAmericancitiesforitsbeauty
Accidentsarecaused:theydon’tjusthappen.Thereasonmaybeeasytosee:an【C1】______tray,ashelfoutofreach,apatchof
Myfatherwasalawyerwithnosons.Sohedecidedthathisolderdaughter,Susie,wouldfollowhiscareer.Itwashisplanthat
Worksofartsandpricelesshistoricalrecordswere______inthebigfire.
随机试题
金属的纯度对热导率的影响很大,一般合金的热导率比纯金属的热导率会()。
完全参与观察
患者,男性,35岁,反复出现食欲缺乏,畏食、呕吐、腹泻等消化不良现象,时感上腹闷胀或疼痛,上腹有轻压痛,胃酸分泌稍低于正常范围,血清胃泌素结果正常,诊断为“慢性胃窦胃炎”。该患者最常见的临床表现是()
在等直梁平面弯曲的挠曲线上,曲率最大值发生在()的截面上。
国际货款结算的基本方式有汇付、托收和信用证3种。其中,信用证的基本当事人有3个。
王某盗窃他人现金3万元,在得知公安机关开始侦查后,因害怕将来被从重处罚,于是向当地检察机关如实交代了自己的罪行和赃款隐藏地点。王某的行为属于()。
已知a=一2i+mj+3k,b=nj-2j一k是空间中的两个向量,则“a∥b”是“m=6,n=”的().
根据以下资料,回答下列问题。下列说法不正确的一项是:
互相尊重和主权领土完整
Undeniably,manyEuropeansarcsuffering.LevelsofunemploymentarethehighestsincerecordsbeganinFrance(3.2million)and
最新回复
(
0
)