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
外语
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 whet
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 whet
admin
2015-02-09
69
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.
What information could be found from the black box on the Yemeni airliner?
选项
A、Data for analyzing the cause of the crash.
B、The total number of passengers on board.
C、The scene of the crash and extent of the damage.
D、Homing signals sent by the pilot before the crash.
答案
A
解析
转载请注明原文地址:https://kaotiyun.com/show/0Oq7777K
0
大学英语四级
相关试题推荐
Academicqualifications’valueintheworkplaceisabigissueforstudents,policymakersandtaxpayers,especiallyastherisin
Disappointment,asuncomfortableandevenpainfulasitcanbeforus,isessentialandimportantonourjourneyofgrowth.Maki
A、Itshouldbeheldaroundthebroadroomtable.B、Itoffersachanceforfamilymemberstoshowopinions.C、Itstimeshouldbe
A、Mr.Smithhassignedthecontract.B、Mr.SmithisunavailabletillThursday.C、Themanshouldhavecalledbeforethevisit.D、
Forthispart,youareallowed30minutestowriteashortessayentitledThePopularityofMicroblog.Youshouldwriteatleast
Manisalandanimal,butheisalsocloselytiedtothesea.【B1】______historytheseahassurvivedtheneedsofman.Theseaha
Manisalandanimal,butheisalsocloselytiedtothesea.【B1】______historytheseahassurvivedtheneedsofman.Theseaha
Forthispart,youareallowed30minutestowriteashortessayentitledShouldUniversityCampusesBeUsedasPublicParkingL
Mostofuswouldshyawayfrommakingpurchasesinaforeigncountryifwedidn’tknowtheexchangerate.Yet,ifprivacyisthe
Classifiedadvertisingisthatadvertisingwhichisgroupedincertainsectionsofthepaperandisthusdistinguishedfromdisp
随机试题
此例可能的诊断该病治疗原则哪项不正确
关于委托指令的分类,说法错误的是()。
案例: 甲曾任乙装修公司(以下简称“乙公司”)经理,2013年3月辞职。5月8日,为获得更多折扣,甲使用其留存的盖有乙公司公章的空白合同书,以乙公司的名义与丙公司订立买卖合同,购买总价15万元的地板,合同约定,6月7日丙公司将地板送至指定地点,乙公司于收
做别人生命中的加号张德芬①你有没有想过,跟人相处的时候,你能为别人的生命带来一点儿什么东西?即使不一定是实质的东西,但可能别人跟你在一起的时候,会觉得很舒服。或是跟你谈一谈心,心结就解
根据下列文字回答126~130题。据初步统计,2004年西部地区(不含西藏,下同),实现地区生产总值27376.33亿元,其中第一产业增加值5325.38亿元,第二产业增加值12175.02亿元,第三产业增加值9875.93亿元。2004年,西部
某单位组织向雅安地震灾区捐款,有33位同事参加该项赈灾捐款,每人的捐款数均为整数。活动监督员在计算平均捐款额的过程中将总捐款数的个位数字和百位数字弄反了,导致平均捐款额比实际结果少了27元。那么这些人捐款的总金额可能为下列哪一项?()
将边长为1的正方体一刀切割为2个多面体.其表面积之和最大为多少?
WhatbroughtaboutthedeclineinthedemandforAmericanfarmproducts?ThechiefconcernoftheAmericangovernmentinthear
Eachcompanyhasmany"publics"whoshouldbeablenotonlytorecognizeitsname【21】______tocorrectlyidentifyitsindustry
Largecompaniesneedawaytoreachthesavingsofthepublicatlarge.Thesameproblem,onasmallerscale,facespractically
最新回复
(
0
)