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
21
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______.Americantobaccocompaniesspend
A、Becausehereyesightwastoopoorwitholdage.B、Becauseshewastooold.C、Becauseshewantedtomakeanewrecord.D、Becaus
A、Mrs.Joneswaspunished.B、Mrs.Joneslostherrecord.C、Thecasewasdismissed.D、Thejudgekepthisrecord.C短文结尾处提到最后对于Mrs.
A、Touseformallanguageinalbums.B、Toobservethenewlawonalbumproduction.C、Toputwarningsignsonrecords.D、Toproduc
A、Becausethelasttrainhasalreadygone.B、Becauseshewantsdifferentwaysoftraveling.C、Becausetakingbuswillbemoreco
A、Naturaldisaster.B、Travelingabroad.C、Healthproblem.D、Studyexperience.A
TheArtofPublicSpeakingIfyouweretotape-recordoneofDavidLetterman’scomedyroutines,memorizeitwordforword,a
随机试题
安能以皓皓之白,而蒙世俗之尘埃乎。(《渔父》)蒙:
下列哪种毒物中毒可使口唇黏膜呈樱桃红色
某餐厅数10名就餐者在进食本餐厅自制的酱牛肉后,于餐后4小时起陆续出现胃肠道症状并伴有发热,体温达38~40℃,最后一名患者是在餐后72小时出现症状,卫生防疫人员到达现场后,经初步调查疑似一起食物中毒,其最可能是
最常伴发急性左心功能衰竭的疾病是()
公共建筑安全出口的数目通常不应少于()个。
下列各项中,属于公司客户的管理状况风险的有()。
值班工作是秘书部门的一项()。
评价会议成功与否,首先要()。
小王每天去体育场跑步,一位叔叔也在锻炼.两人沿400m跑道跑步,每次总是小王跑2圈时,叔叔跑了3圈.
指挥中心接某金店老板报案称,刚才一男子进店后持刀威胁,抢走10条金项链后逃跑。指挥中心指令就近民警赶赴现场先期处置。根据已知信息,本案中可以作为现场访问重点对象的有:
最新回复
(
0
)