首页
登录
职称英语
Many great inventions are greeted with ridicule and disbelief. The invention
Many great inventions are greeted with ridicule and disbelief. The invention
游客
2023-11-17
76
管理
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 Because of their efforts, the old tables were repealed in time and replaced by the first reliable figures for air pressure on curved surfaces.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. [br] The old tables were______and replaced by the first reliable figures for air pressure on curved surfaces.
选项
A、destroyed
B、canceled
C、multiplied
D、discarded
答案
D
解析
细节题。“old tables”是定位关键词,第四段“the old tables were repealed in time and replaced by the first reliable figures for air pressure on curved surfaces”可看出原数据经过新的实验后被修订了。
转载请注明原文地址:http://tihaiku.com/zcyy/3194886.html
相关试题推荐
Homeowners:areyouawarethatthere’sanall-newelectronicinventioncall
TheIndustrialRevolution______intheinventionofthesteamengine.A、originat
WhataccountsforthegreatoutburstofmajorinventionsinearlyAmerica-b
Theinventionofelectricitymadegreatcontributiontocivilization______whic
______mainlyfortheinventionofthetelephone,AlexanderGrahamBelldevoted
WhataccountsforthegreatoutburstofmajorinventionsinearlyAmerica-
WhataccountsforthegreatoutburstofmajorinventionsinearlyAmerica-
Manygreatinventionsaregreetedwithridiculeanddisbelief.Theinvention
Manygreatinventionsaregreetedwithridiculeanddisbelief.Theinvention
Manygreatinventionsaregreetedwithridiculeanddisbelief.Theinvention
随机试题
ThefollowingispartofamemorandumfromthepresidentofHumanaUniversity."
Aspark,aflint:HowfireleapttolifeThecontroloffire
下列关于气体灭火系统适用范围的叙述中,错误的是()。A.七氟丙烷灭火系统适
火灾探测器布置时,当梁凸出顶棚的高度超过()mm时,被梁隔断的每个梁间区
建筑物分为甲、乙、丙、丁四个抗震设防类别,指出下列哪一个分类是不正确的?()
下列哪项不是清热调血汤的组成药物A.当归、川芎、白芍、生地 B.元胡、香附
下列特定穴中,除哪项外均位于肘膝关节以下A.原穴 B.十二经络穴 C.下合穴
(2017年年真题)某县下辖的H镇,因公共基础设施建设需要,征收该镇东南街区国
下面①和②分别是给定立体图形的正视图和后视图,此立体图形由三块完全相同的图形构成
()是指受资国中央银行收购外汇资产而相应投放的本国货币。A:外汇储备 B:金融
最新回复
(
0
)