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
31
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.
Why was the black box redesigned in 1965?
选项
A、New materials became available by that time.
B、Too much space was needed for its installation.
C、The early models often got damaged in the crash.
D、The early models didn’t provide the needed data.
答案
C
解析
转载请注明原文地址:https://kaotiyun.com/show/MOq7777K
0
大学英语四级
相关试题推荐
A、Non-smokingareasshouldgetexpanded.B、Publicrelationsaffectpersonalachievements.C、Policy-makersshouldconnectrelatio
Walking,ifyoudoitvigorouslyenough,istheoverallbestexerciseforregularphysicalactivity.Itrequiresnoequipment,e
A、Hebuyssomemedicineforher.B、Hetriestofindajobforher.C、Helendshersomemoney.D、Heletsherliveinhisapartmen
Lessthan60%ofstudentsnowenteringfour-yearAmericancollegesarelikelytograduate.The【B1】______rateislowerthanfora
Acidrain,whichisaformofairpollution,currentlybecomesasubjectofgreatdebatebecauseofwidespreadenvironmentaldam
A、Theysharecertaintraditionalcustoms.B、Theysharecertaintravelplaces.C、Theysharecertaintraditionalfoods.D、Theysha
Wisebuyingisapositivewayinwhichyoucanmakeyourmoneygofurther.Thewayyougoaboutpurchasinganarticleoraservi
A、Hecouldhelpherwiththeproblems.B、Hecouldgoouttogetherwithher.C、Sheshouldgooutforawhile.D、Sheshoulddothe
A、Printingmoney.B、Determiningstatetaxes.C、Makingtreatieswithforeigncountries.D、Passinglawsaffectingtradebetweenst
A、Itisraining.B、Thewomanwilltakeherumbrella.C、Thewomanwillnotaccepttheman’sadvice.D、Thewomanwilltakeashowe
随机试题
患者,女,45岁。发热伴皮肤黏膜出血1周。查体:贫血貌,胸骨压痛,血红蛋白70g/L,白细胞14×109/L,血小板12×109/L。最需做的检查是
小唾液腺肿瘤发生最多的部位是A.唇部B.颊部C.舌部D.口底E.腭部
以下出现幼稚化生骨小梁的是
阴虚动风证的临床特点是
(浙江2008—14)一个边长为1的正方形木板,锯掉四个角使其变成正八边形,那么正八边形的边长是多少?()
儿童同情感产生的年龄大约是()。
设A-1=,求(A*)-1.
软件开发的结构化分析方法的主要分析对象是()。
程序设计语言的基本成分是数据成分、运算成分、控制成分和______。
A、BecausehewasafamousEnglishwriter.B、Becauseheenjoyedwalkingalongthestreet.C、Becausehehadagoodmemory.D、Becau
最新回复
(
0
)