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
Why were the Wright brothers able to succeed in an effort at which so many others had failed? Many explanations have been mentio
Why were the Wright brothers able to succeed in an effort at which so many others had failed? Many explanations have been mentio
admin
2011-02-28
29
问题
Why were the Wright brothers able to succeed in an effort at which so many others had failed? Many explanations have been mentioned, but three reasons are most often cited. First, they were a team. Both men worked congenially and cooperatively, talked incessantly about the possibility of manned flight, and served as a conscious source of inspiration and encouragement to each other.
Both were glider pilots. Unlike some other engineers who experimented with the theories of flight, they experienced the practical aspects of aerodynamics by building and flying in kites and gliders. They had realized from their experiments that the most serious challenge in manned flight would be stabilizing and maneuvering the aircraft once it was airborne. While others concentrated their efforts on the problem of achieving lift for take-off, they were focusing on developing a three axis control for guiding their aircraft.
In addition, the Wright brothers had designed more effective wings for the airplane than had been previously engineered. Using a wind tunnel, they tested more than two hundred different wing designs, recording the effects of slight variations in shape on the pressure of air on the wings. The data from theses experiments allowed the Wright brothers to construct a superior wing for their air craft. In spite of these advantages, however, the Wright brothers might not have succeeded had they not been born at precisely the opportune moment in history. Attempts to achieve manned flight in the early nineteenth century were doomed because the steam engines that powered the aircrafts were so heavy in proportion to the power that they produced. But by rite end of the nineteenth century, when the brothers were experimenting with engineering options, a relatively light internal combustion engine had already been invented, and they were able to bring the ratio of weight to power within acceptable limits for flight.
Why does the author suggest that the experiments with the wind tunnel were important?
选项
A、Because they allowed the Wright brothers to decrease the weight of their airplane.
B、Because they resulted in a three-axis control for their airplane.
C、Because they were important in the refinement of the wings for their airplane.
D、Because they used the data to improve the engine for their airplane.
答案
C
解析
从文章第三段可以推断,目的在于找出最佳的机翼形状。
转载请注明原文地址:https://jikaoti.com/ti/yqdsFFFM
本试题收录于:
公共英语三级笔试题库公共英语(PETS)分类
0
公共英语三级笔试
公共英语(PETS)
相关试题推荐
【26】【39】
【26】【27】
Whichofthefollowingisnottrue?
Overweighthasbecomeaproblempeopleallaroundtheworldface,anditdoesnotlooklikeitwillbesolvedinthenearfuture
Whichfacilityisnotavailableintheapartmentbuilding?
Inparagraph1,whenthewriterrecallssomethingsthathappenedbetweenhimandhisfriends,______.Themainpurposeofthis
WhichofthefollowingfactorisNOTmentionedwhendiscussingthepersonsinterviewedintheresearch?Whatisthebesttitle
Whatdoesthemanproposetodofirst?
ItwasfifteenpastnineasMariehurriedintotheofficebuildingwhereshewasgoingtowork.Herbushadinchedalongthrough
随机试题
Alandfreefromdestruction(破坏),pluswealth,naturalresources,andlaborsupply—allthesewereimportant【C1】______inhelping
患者小便热涩刺痛,尿色深红,或夹有血块,疼痛满急加剧,或见心烦,舌尖红,苔黄,脉滑数。其治疗方法是
在评估投资价值时,折现率是()。
对于建设项目环境影响的(),应从社会整体角度对建设项目环境影响的经济费用和效益进行识别和计算。
下列对舞弊的说法中,恰当的有()。
以下不属于宏观经济指标的是()。
()对于“河南”相当于“鲁”对于()。
一个人被一条狗咬了之后就害怕所有的狗,这一现象称为()
数据传输速率是描述数据传输系统的重要技术指标之一。数据传输速率在数值上等于每秒钟传输构成数据代码的二进制()。
ThewarforindependencefromBritainwasalongandeconomicalcostlyconflict.TheNewEnglandfishingindustrywas【B1】______d
最新回复
(
0
)