You haveneverseen him,butthey'rewithyoueverytimeyoufly....
问题详情:
You have never seen him,but they're with you every time you record where you are going,how fast you're traveling and whether everything on your airplane is functioning r ability to withstand(经受得住)almost any disaster makes them seem like something out of a magic '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 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 was the first mode for a black box,which became a requirement on all ercial flights by y models often failed to withstand crashes,however,so in 1965 the device(装置)was completely redesigned and moved to the back of the plane-the area least affected bu 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 ed 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℉ in deep water,they're also able to emit signals from depths of 20,000 rts 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 the approximately 20 deep-sea crashes over the past 30 years,only one plane's black boxes were never recovered.
9. In Paragraph 1,the author wants to say the black box_________.
A. comes from a comic book B. is an necessary device on an airplane
C. can prevent disasters D. can control the function of an airplane
10. From the black box on the Yemeni airliner _________ could be found.
A. the scene of the crash and the degree of the damage B. the total number of passengers on board
C. homing signals sent by the pilot before the crash D. data for analyzing the cause of the crash
11. Why was the black box redesigned in 1965?
A. The early models often got damaged in the crash. B. New materials became available by that time.
C. Too much space was needed for its device. D. The early models didn't provide the needed data.
12. What do we know about the black boxes from Air France Flight 447?
A. They have stopped sending homing signals. B. There is an urgent need for them to be reconstructed.
C. There is still a good chance of their being recovered. D. They were destroyed somewhere near Brazil.
【回答】
BDAC
知识点:阅读理解
题型:阅读理解
-
以KCl和ZnCl2混合液为电镀液在铁制品上镀锌,下列说法正确的是( )A.未通电前上述镀锌装置可构成原电池...
问题详情:以KCl和ZnCl2混合液为电镀液在铁制品上镀锌,下列说法正确的是()A.未通电前上述镀锌装置可构成原电池,电镀过程是该原电池的充电过程B.因部分电能转化为热能,电镀时通过的电量与锌的析出量无确定关系C.电镀时保持电流恒定,升高温度不改变电解反应速率D.镀锌层破...
-
目前,制造*自己航母的呼声越来越高,如图所示是某位网友提供的*航母的设想图.一艘航母的舰载机飞离航母后,则...
问题详情:目前,制造*自己航母的呼声越来越高,如图所示是某位网友提供的*航母的设想图.一艘航母的舰载机飞离航母后,则有()A.航母将上浮,所受浮力减小B.航母将下沉,所受浮力增大C.航母将下沉,所受浮力减小D.航母始终漂浮,所受浮力不变【回答】考点:物体的浮沉条件及其应用.347398...
-
下列各组词语中,没有错别字的一组是A.闲情逸致 声名鹊起 意气相投 金碧辉煌B.情随事迁 隐约...
问题详情:下列各组词语中,没有错别字的一组是A.闲情逸致 声名鹊起 意气相投 金碧辉煌B.情随事迁 隐约其辞 夸夸奇谈 前赴后继C.梦寐以求 百折不挠 闻过饰非 惨淡经营D.言简意赅 言近指远 伸张正义 良辰...
-
设,若,则a=( )A.-1 B.0 C.2 D.3
问题详情: 设,若,则a=( )A.-1 B.0 C.2 D.3【回答】D知识点:导数及其应用题型:选择题...
相关文章
- Haveyouevergotyourlunch,butnotknownwheretosit?Youdon'tw...
- —Imustsaygoodbyetoyou.Ifeelveryupset.—Cheerup! Itwon'tb...
- (onthemobilephone)﹣Whereareyou?Ican'tseeyouhereatthethe...
- WhenyouareinEngland, youmustbeverycarefulinthestreet61
- Thefirespreadthroughthehotelveryquicklybuteveryone
- -Thenovelseemsalittleboring.-Youwon'tenjoyit youputyo...
- Youneverseethem,buttheyarewithyoueverytimeyoufly.Theyre...
- —WithyourhelpI’vecomefirst intheboy’s100meters.Thankyou...
- WaystoFreeYourMindWhenYou'reFeelingStuckHaveyoueverfelt...
- Themoreyougivetoothers,themoreyoureapyourself.Whenyoush...