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
2015-06-23
43
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°F. 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
细节题。文章第二段第一句以也门飞机失事为例,说明黑匣子的作用:当飞机坠毁时,黑匣子能够确定故障出在哪儿。由此可推断,从黑匣予中可找出也门飞机失事的原因,故正确答案为A。选项B、C、D在文中并未提及。
转载请注明原文地址:https://jikaoti.com/ti/Ka3FFFFM
0
大学英语四级
相关试题推荐
A、Sheshowsjealousyaboutthebeauty.B、Sheshowssatisfactiontothepicture.C、Make-upcanturntheuglytobethebeauty.D、
A、Ajoblisting.B、Aresume.C、Apermissionslip.D、Theirsalaryrequirements.B短文中提到的stopbyourofficeandbesuretobringa
Self-motivationisbasicallytheabilitytogetyourselftotakeactionwhetheryoufeellikeitornot.Manypeoplehavea【B1】_
A、Hewantstobecomeacook.B、Hehopestogoontograduateschool.C、Hewantstotravelaroundtheworld.D、He’dliketowork
Wheredopesticides(杀虫剂)fitintothepictureofenvironmentaldisease?Wehaveseenthattheynow【C1】______soil,water,andfood
Howusefularetheviewsofpublicschoolstudentsabouttheirteachers?Quiteuseful,accordingtopreliminaryresultsrele
A、Languagelearners.B、Magazinecollectors.C、Europeanjournalists.D、Professionaltravellers.A根据上题的分析,欧洲独特的视听杂志是为了提高听力等语言能力,结合
A、DifferentFormsofExerciseB、Exercise—TheRoadtoHealthC、Running—APopularFormofSportD、ScientificEvidenceofHealt
A、Whentheecologicalbalanceoftheriverislost.B、Whenpeopleconsumemorefishthantheyusedto.C、Whenlargenumbersofa
Thethousandsofpeopleforcedtoabandontheirhomesinrecentweekstofloodwatersarevictimsnotjustofnaturebutofhuman
随机试题
将会计凭证分为原始凭证和记账凭证的分类标准是
下列关于子宫肌瘤变性说法不正确的是下列哪项
患者,女,48岁,在一次交通事故中,因丈夫意外身亡而悲伤过度。事后被问及,没有任何印象,到医院检查,无脑器质性病变。该患者的症状是()
下列市场中,任何专业投资者的边际市场价值为零的是()。
个人独资企业的投资人出现下列()违法行为可以被处以吊销营业执照的处罚。
信息系统包括所有涉及信息收集、储存、产生和分配的系统和程序。信息系统可分为七类,其中执行和处理常规事务的系统是()。
D
下列规范性法律文件中,属于程序法的是()
Dopeoplegethappierormorefoul-temperedastheyage?Stereotypesofirritableneighbors【C1】______,scientistshavebeentry
Readthearticlebelowaboutadvertisingstrategy.Aresentences16-22"Right"or"Wrong"?Ifthereisnotenoughinformationto
最新回复
(
0
)