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 features similar to those aeronautical innovations developed by man can be observed amongst birds, insects and plants. At t
Many features similar to those aeronautical innovations developed by man can be observed amongst birds, insects and plants. At t
admin
2009-06-15
57
问题
Many features similar to those aeronautical innovations developed by man can be observed amongst birds, insects and plants. At times, observations of these natural phenomena have inspired man to imitate nature and modify existing designs. At other times, the natural example has only been recognized well after great amounts of time and valuable materials have been devoted to refining a similar human invention.
Birds deserve credit not merely for demonstrating flight was possible, but for providing templates for the shape of aircraft wings. The wings of birds suggested the pattern for leadingedge wing slots that improve ascent at slow speeds and for conical cambered wingtips that increase lift and stability. Other characteristics of bird wings, such as a trailing edge flap to aid in smooth landings, were not recognized as important until they had been designed independently by aeronautical engineers. Considerable research effort in aeronautics could probably have been saved by more thorough analysis of bird flight.
The insect world has also contributed significant ideas in the realms of navigation and guidance. In order to aid airline navigation during take-offs and landings under adverse weather conditions, engineers developed a system for locating the sun when it was hidden by clouds through observing polarized light—light which travels in a single direction. The research was instigated(鼓励,激发)after studies of honey bees demonstrated that they used this mechanism to determine their location when the sky was darkened. In another credit to the insect world, the evasive guidance systems of certain missiles use angular acceleration detectors modeled after the multi-lensed eyes of houseflies which amplify subtle movements by splitting images into a mosaic(马赛克)resembling a large display of televisions tuned to the same channel.
Even entities which never take flight themselves are responsible for guiding the hand of aeronautical engineers. The winged seed of a palm tree was the model for an early glider, and the single-winged, autorotating maple seed was the prototype for a means of air-dropping cargo by parachute.
选项
A、more advanced products were used in airplanes
B、more research was devoted to studying bird flight
C、greater efforts were directed towards shape designs of aircraft wings
D、greater emphasis was put on guidance systems
答案
B
解析
从第二段最后一句“靠着对鸟类飞行更彻底的分析本来可以节省相当一部分的研究精力”,可知B为正确答案。
转载请注明原文地址:https://kaotiyun.com/show/5PLd777K
本试题收录于:
职称英语理工类A级题库职称英语分类
0
职称英语理工类A级
职称英语
相关试题推荐
A.Doescanceralwayscausepain?B.Cancancerbeprevented?C.Whatiscancer?D.Howcommoniscancer?E.Whatcausescancer?
Thenumberofprematurelystoppedclinicaltrialshasincreasedrecently.Someofthetrialswereprobablystoppedearlyforco
Pandemic(大面积流行的)H1N12009ThemostactiveareasofpandemicinfluenzatransmissioncurrentlyareincentralandeasternEur
FalseFearofBigFishManypeoplebelievesharks(鲨鱼)aredangerousandwillalwaystrytohurtorevenkillhumans.46
AcanbefoundinParisBthemajoreventsofthenationCofthecountry’sindustriesDalotofcinemasandtheatresEhasbee
LifeExpectancyintheLastHundredYearsAhundredyearsago,lifeexpectancyindevelopedcountrieswasabout47;inthee
ScientistsDevelopWaysofDetectingHeartAttackGermanresearchershavecomeupwithanewgenerationofdefibrillators(除颤
MigrantWorkersInthepasttwentyyears,therehasbeenanincreasingtendencyforworkerstomovefromonecountrytoanot
WhichofthefollowingstatementsisNOTtrueoftheJapaneseconceptcar?WhathasVolvodeveloped?
TheindustrialrevolutionmodifiedthewholestructureofEnglishsociety.
随机试题
男性,70岁,体检时发现PSA明显升高。前列腺穿刺检查,病理诊断为前列腺癌GleasonⅠ级。下列描述中,与本诊断相符的是
A.普济消毒饮B.一贯煎C.五味消毒饮D.明目地黄汤E.六味地黄汤治疗糖尿病并发雀盲应首选
A.现况研究B.病例对照研究C.队列研究D.流行病学实验研究E.分析性研究由研究者控制干预措施的研究为
A.第一类B.第二类C.第三类D.第二类和第三类实行备案管理的医疗器械是()。
关于缓刑,下列哪一选项是错误的?
(2009年)根据《建设工程勘察设计管理条例》的规定,编辑初步设计文件应当()。
根据《建筑工程建筑面积计算规范》(GB/T50353—2013),设计加以利用并有围护结构的深基础架空层的建筑面积计算,正确的是()。
不考虑其他影响因素的情况,下列表述中反映企业偿还债务能力较弱的有()。
Wearewitnessingdiminishingfaithininstitutionsofallkinds.Peopledon’ttrustthegovernment.Theydon’ttrustbanksand
Ithinkyoucantakea(n)______languagecoursetoimproveyourEnglish.
最新回复
(
0
)