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
Many great inventions are greeted with ridicule and disbelief. The invention of the airplane was no exception. Although many peo
Many great inventions are greeted with ridicule and disbelief. The invention of the airplane was no exception. Although many peo
admin
2010-11-29
67
问题
Many great inventions are greeted with ridicule and disbelief. The invention of the airplane was no exception. Although many people who heard about the first powered flight on December 17,1903, were excited and impressed, others reacted with peals of laughter. The idea of flying an aircraft was repulsive to some people. Such people called Wilbur and Orville Wright, the inventors of the first flying machine, impulsive fools. Negative reactions, however, did not stop the Wrights. Impelled by their desire to succeed, they continued their experiments in aviation.
Orville and Wilbur Wright had always had a compelling interest in aeronautics and mechanics. As young boys they earned money by making and selling kites and mechanical toys. Later, they designed a newspaper-folding machine, built a printing press, and operated a bicycle-repair shop. In 1896, when they read about the death of Otto Lilienthal, the brother’s interest in flight grew into a compulsion.
Lilienthal, a pioneer in hang-gliding, had controlled his gliders by shifting his body in the desired direction. This idea was repellent to the Wright brothers, however, and they searched for more efficient methods to control the balance of airborne vehicles. In 1900 and 1901, the Wrights tested numerous gliders and developed control techniques. The brothers’ inability to obtain enough lift power for the gliders almost led them to abandon their efforts.
After further study, the Wright brothers concluded that the published tables of air pressure on curved surfaces must be wrong. They set up a wind tunnel and began a series of experiments with model wings. Because of their efforts, the old tables were repealed in time and replaced by the first reliable figures for air pressure on curved surfaces. This work, in turn, made it possible for them to design a machine that would fly. In 1903 the Wrights built their first airplane, which cost less than one thousand dollars. They even designed and built their own source of propulsion — a lightweight gasoline engine. When they started the engine on December 17, the airplane pulsated wildly before taking off. The plane managed to stay aloft for twelve seconds, however, and it flew one hundred twenty feet.
By 1905 the Wrights had perfected the first airplane that could turn, circle, and remain airborne for half an hour at a time. Others had flown in balloons or in hang gliders, but the Wright brothers were the first to build a full-size machine that could fly under its own power. As the contributors of one of the most outstanding engineering achievements in history, the Wright brothers are accurately called the fathers of aviation.
Lilienthal’s idea about controlling airborne vehicles was______the Wrights.
选项
A、proven wrong by
B、opposite to the ideas of
C、disliked by
D、accepted by
答案
C
解析
细节题。Lilienthal是关键词,出现在文中第二、三段。
转载请注明原文地址:https://kaotiyun.com/show/It1K777K
0
专业英语四级
相关试题推荐
Thefirsttwostagesinthedevelopmentofcivilizedmanwereprobablytheinventionofweaponsandthediscoveryoffire,altho
IsContinuingEdforYou?Continuingeducationisimportantforeveryonenow,inallfields.Almostassoonasyou’vecomp
IsContinuingEdforYou?Continuingeducationisimportantforeveryonenow,inallfields.Almostassoonasyou’vecomp
Somepeoplebelievethatyouhavetobeaspecialkindofpersontosellaproduct.Butalthoughitisclearthatasuccessfuls
OnlinePriceWarsE-commercecustomersfeelthatover80percentoftheirdecisiontopurchaseornotresideinissuesbeyo
CoffeeCoffeeprobablyderivesitsnamefromtheArabic"gahwah",althoughsomeetymologistsconnectitwiththenameKaffa,
JohnD.Rockefeller,______,owned90percentofallAmericanoilrefineries.
Gangs’"Protection"Althoughfromanobjectivepointofview,wecanseejoiningagangbringsmoredangerthanitsavesy
随机试题
骨折的治疗原则中,除复位、固定还有
描述噪声强度的客观指标
A.槟榔B.贯众C.雷丸D.鸡内金E.榧子杀虫截疟的是()。
关于光缆的施工要求,正确的有()。
项目经理在项目管理方面的主要任务包括()。
下列关于债券投资的说法,不正确的是()。
由于旅游者方面的原因,或由于途中遇到交通事故严重堵车,汽车发生故障等突发情况造成延误等,属于责任事故。()
在市场经济比较发达的国家,凡是出现通货紧缩,一般都是在财政和货币政策方面实行:
窗体上有一个名称为Command1的命令按钮,其事件过程如下:PrivateSubCommand1_Click()x="VisualBasicProgramming"a=Right(x,11)b=Mid(x,7,5)c=MsgBox(a,,b
Discussion—about5minutesInthispartofthetesttileexaminerreadsoutascenarioandgivesyousomepromptmaterialittth
最新回复
(
0
)