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
54
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.
The word" incessantly" ( Para 1 ) could best be replaced by ______.
选项
A、confidently
B、constantly
C、intelligently
D、optimistically
答案
B
解析
由上下文推断,incessantly是“不休止”的意思,和constantly“坚持不懈地”意思上更为相近。
转载请注明原文地址:https://kaotiyun.com/show/F1kd777K
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】【34】
Thispassagecouldbeentitled______.The"Fingertips"______.
Whatisthemainideaofthispassage?Whatisthemostimportantforyoutoconsiderwhensomebodysay"Iloveyou"toyou?
WhatisMs.Bush’smainpurposeforthetrip?
WhichofthefollowingfactorisNOTmentionedwhendiscussingthepersonsinterviewedintheresearch?Whatisthebesttitle
What’sthemainpurposeofthistalk?
Whatisonethingtheapartmentbuildingwhichthewomandescribesdoesnothave?
Whatdoesthemanproposetodofirst?
随机试题
股骨上1/3骨折,近折片的移位方向,是
某公司计划对某一项目进行投资,投资额为300万元,期限为5年,每年净现金流量分别为150万元、200万元、200万元、100万元、200万元。假设资本成本率为10%。该项目的净现金流量及复利现值系数如下表所示:根据以上资料,回答下列问题:如果不考虑
刘老师在初中任教已近30年,教学成绩突出,深受学生喜爱,曾获得过省级优秀教师等荣誉。但近年来随着多媒体教学和网络教学的普及,学校要求在教学中必须用多媒体进行教学。刘老师对这种要求很不以为然,校长找他谈话并要求他学习电脑、网络和多媒体知识,他却说;“我课本、
首次提出“隐性课程”概念的学者是_______,被誉为“现代课程理论之父”的教育家是_______。()
对党员的纪律处分有()。
根据以下资料。回答81—85题。2009年第一季度,某省第一产业实际利用外资0.27亿美元,下降43.1%,第二产业实际利用外资23.22亿美元,下降4.7%。服务业仍然是今年外商实际投资的亮点。一季度,服务业实际利用外资13.65亿美元,占该省的
有一个文件含有10000个文件块,若将其顺序结构存放,则对文件块顺序查找的平均时间为5000个单位。若按索引顺序文件的结构存放,每个索引为。100个文件块,则顺序查找次数是()。
Lookatthestatementsbelowandtheinformationaboutmandoingwomen’swork.Whichpieceofinformationdoeseachstatement1
Ascollegeseniorshurtleintothejobhunt,littlefibsontheresume--forexample,claimingsdegreewhenthey’rethreecredit
A------trackandfieldJ------roadraceB------cheerleaderK------platformdivingC------No.1se
最新回复
(
0
)