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
2013-11-21
37
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
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,从黑匣子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://kaotiyun.com/show/SNS7777K
0
大学英语四级
相关试题推荐
WatchoutforFallingSatellitesWhatIsHappening?Anout-of-controlUSspysatellitewillcrashtoEarthinthecoming
WatchoutforFallingSatellitesWhatIsHappening?Anout-of-controlUSspysatellitewillcrashtoEarthinthecoming
WatchoutforFallingSatellitesWhatIsHappening?Anout-of-controlUSspysatellitewillcrashtoEarthinthecoming
Peopleindevelopingcountriesareeasilyaffectedbycigaretteadvertisementbecause______.Whatcanbeinferredfromthelas
A、Shebrokeherrecord.B、Shedidn’tstopataredlight.C、Shesawanaccident.D、Shestoppedataredlight.B事实细节题。短文第二段提到“Th
A、Tokyoisveryattractive.B、TravelingtoTokyoisexciting.C、HelikesbuildingsinTokyo.D、HewantstovisitTokyoagain.B女
A、Naturaldisaster.B、Travelingabroad.C、Healthproblem.D、Studyexperience.A
A、Talktohissecretary.B、Makeaphonecall.C、Chatwiththewoman’shusband.D、Recordthecontentoftheirtalk.C
TheArtofPublicSpeakingIfyouweretotape-recordoneofDavidLetterman’scomedyroutines,memorizeitwordforword,a
随机试题
甲公司为一家在深圳证券交易所上市的企业,主要从事饮料包装成套设备的研发、生产和销售。2015年度,甲公司发生的部分业务资料如下:(1)2015年2月5日,甲公司通过全国中小企业股份转让系统以每股5元的价格购入A公司股票2000万股,取得A公司40%有表决
气象服务经济包含两层意义,一是指利用气象服务来防灾、抗灾以避免风险和损失;二是指利用有利的气象条件来创造效益。人们可以利用气象信息作为从事经济活动的决策依据之一,可以根据气象服务提供的信息,安排生产经营活动,减少经济损失,提高经济效益。根据上述定
宫颈阴道部的________上皮与________上皮交界处称为宫颈的________,此区是宫颈癌的高发区域。
患者,男,28岁。一年来下腹疼痛,伴大便次数增多,常于上午上班前大便3~4次,稀水便,偶伴黏液,排便后腹痛缓解,一般每周发作2~3次,患者一般情况好,体检仅发现左下腹压痛,余无异常。最可能的诊断是
在治疗休克过程中,监护输液量及输液速度的最好的指标是
患者,男性,35岁。患慢性肾炎已4年,加重伴少尿1周。BP180/100mmHg,内生肌酐清除率8.7ml/min,诊断为慢性肾小球肾炎、慢性肾衰竭尿毒症期。下列哪项是患者开始透析的指征
男,75岁。间断咳嗽,咳痰12年,加重伴气短2天就诊。吸烟40余年,每天约1包。胸部X线片示双肺纹理粗乱。动脉血气示pH7.34,PaCO248mmHg,PaO255mmHg。该患者氧疗的最佳方式是
根据房产税法律制度的规定,下列有关房产税的表述中,错误的是()。
材料一:我原来在小学是个很爱提问的人,可是每次提问都被否定了。记得有一次,甲老师在教古诗《春晓》时,我觉得有疑问,就问:“老师说诗人春天好睡觉,连天亮都不晓得,那他夜里怎么能听见风雨声呢?”甲老师很不以为然地说:“这有什么奇怪的?早上起床到外面一看不就知道
handleoncontinuedtoA.Thetrendwasnaturallymostobviousinthoseareasofsciencebasedespecially【T1】______amathemat
最新回复
(
0
)