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
88
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
A、StudentscansurftheInternetathome.B、Schoolscandevelopmoreclassesonline.C、Peoplecangetallkindsofinformationo
A、Pamela’sreportisnotfinishedasscheduled.B、Pamelahasahabitofdoingthingsinahurry.C、Pamelaisnotgoodatwriting
A、Becauseshecouldn’trecognizeherformerclassmate.B、Becausethemandidn’tunderstandher.C、Becauseshedidn’thaveenough
A、Themanshouldshutthewindowtightly.B、Themanshouldputsomescrewsinthewood.C、Themanshouldsticktohiswork.D、Th
A、Advertisingispersonal.B、Advertisementsareconvincing.C、Advertisementsareunreliable.D、Advertisementsaremisleading.B细
A、Shemakesthekeypaddirty.B、Shealwaysdropscrumbsoffthecomputerkeyboard.C、Shealwayseatsoffatoiletseat.D、Itis
Manisalandanimal,butheisalsocloselytiedtothesea.【B1】______historytheseahassurvivedtheneedsofman.Theseaha
A、Printingmoney.B、Determiningstatetaxes.C、Makingtreatieswithforeigncountries.D、Passinglawsaffectingtradebetweenst
A、Theywanttofindabetterpart-timejob.B、Theyhopetobewelltrainedindifferentfields.C、Theyplantodosomesocialwo
随机试题
重新点燃启蒙的火炬在告别20世纪而进入21世纪之际,中国思想界对启蒙有截然相反的看法。有人历数启蒙的罪状,劝告知识分子放弃启蒙立场;有人则回顾启蒙被压倒的悲剧,希望在中国“重新点燃启蒙的火炬”。面对思想界的矛盾和种种困惑,有一个问题必须回答:今日
下列选项中,均属于原核细胞型微生物的是
酚多氯联苯
背景某总承包单位将一医院的通风空调工程分包给某安装单位,工程内容有风系统、水系统和冷热(媒)设备。设备有7台风冷式热泵机组,9台水泵,123台吸顶式新风空调机组,1237台风机盘管,42台排风机,均由业主采购。通风空调工程的电气系统由总承包单位施工。
为防止由技术不正确或意外原因发生的危险,运用特定技巧使练习者摆脱危险的方法叫()。
国家主席是我国宪法规定的一个重要的国家机构。()
将一个充满气的氢气球自由释放,它将()。
社会基本矛盾是社会发展的根本动力。其作用主要表现在()
2022年5月10日,国家发展改革委向社会发布《“十四五”生物经济发展规划》。这是我国首个生物经济五年规划。这标志着生物经济已经成为一种新的经济形态。下列不属于文件提出的四大重点发展领域的是()。
有如下类定义:classMyClass{intvalue;public:MyClass(intn):value(n){}intgetValue()const{returnvalue;}};则类MyClass的构造函数的
最新回复
(
0
)