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
【C1】______ nearly a hundred years of powered flight, scientists are still trying to figure out how birds fly. Researchers have
【C1】______ nearly a hundred years of powered flight, scientists are still trying to figure out how birds fly. Researchers have
admin
2010-01-10
55
问题
【C1】______ nearly a hundred years of powered flight, scientists are still trying to figure out how birds fly.
Researchers have learned that the slapping noise pigeons make when they suddenly take off is the sound of super charged lift. They call it the "clap fling" effect.
Here at SRI International scientists try to duplicate the pigeons’ thrust. A flashing strobe reveals the secret.
Scott Stanford, a scientist at SRI, says, You re looking at the clap fling effect, where the two wings will come together and peel apart 【C2】______ each other, thus augmenting lift 【C3】______ drawing air from the top to the bottom. "
This mechanical bug won’t get off the ground. 【C4】______ its flapping wings demonstrate a potential propulsion system for robotic birds: man-made rubbery muscle.
Roy Kornbluh works at SRI. "There, I’m turning the voltage on and off, and you can see when the voltage is on, the material is larger 【C5】______ when the voltage is off."
Super computers show high-speed airflows over supersonic aircraft.
But scientists have only begun to see how air flows 【C6】______ really low speeds.
Professor Max Platzer of the Naval Postgraduate School, says, "The flapping wing is generating a thrust, this way, this is the basic physics of the phenomenon."
It’s pelicans--not pigeons--the Navy is looking at. The Navy is looking at the smooth easy flight of pelicans low over water--called "ground effect." Researchers at the Naval Postgraduate School are trying to imitate the pelican’s efficiency.
Assistant Professor Kevin Jones of the Naval Postgraduate School says, " 【C7】______ flapping the wings, symmetrically, we’re 【C8】______ effect imitating ground effect. We now have the same feature a bird sees when it’s flying, over a ground plane."
An electric motor drives the flapping wings. Researchers here are working 【C9】______ ways to beam power to the tiny bird.
David Jenn of the Naval Postgraduate School says, "There’s no battery inside of here, so we’re going to set this inside the radar beam, and the energy is extracted from the radar beam and will be used to propel the motor."
Scientists are learning it’s one thing to build an airplane, 【C10】______ quite another to build a bird.
【C1】______
选项
答案
After
解析
转载请注明原文地址:https://kaotiyun.com/show/eDKd777K
本试题收录于:
BEC高级阅读题库BEC商务英语分类
0
BEC高级阅读
BEC商务英语
相关试题推荐
Whattypeofbusinessisbeingadvertised?
WhattypeofbusinessdoesJackWilliamsown?
Howmanyinternsarebeingintroduced?
Whatkindofbusinessisbeingadvertised?
A、 B、 C、 C(A)重复使用position一词,易造成混淆。(B)使用了与问题中的position(职位)有关的表达方式“提交申请(submitmyapplication)”,容易造成误导。(C)针对询问方法
Whatistheproblematthefactory?
Whatproblemismentioned?
Isenvironmentprotectionimportant?Why?
StilesReductionYourcompanyisaninternationalcompanywhichproduceselectronicproducts.Yourcompany’ssaleshavereduced
•Youwillhearabusinesspresentationabout3simplesellingtactics.•Asyoulisten,forquestions1—12,completethenotes,
随机试题
对于闭路电视监控系统,下列说法正确的是()。
EarthquakesinNewZealanddonotcausfemanydeathsbecauseof______.()
(Para.2,PassageThree)Nothingsays"Hey,wearenothome!"likewhenyourpostboxisfilledwithallkindsofmailsandy
下述哪项可能出现胸痛
甲与乙签订了一份马的试用买卖合同,试用期间为两个月。乙牵回马后,立即与丙签订了买卖合同。双方约定,马的所有权自合同签订之日起转移给丙,但在丙10日内凑齐马款,交付乙后,才将马交付给丙。至第7日,乙因向丁借款又将该马出质于丁,且将该马交付于丁。至第8日,丙与
阅读下列FORTRAN程序:REALA(5)COMMON/CC/XDATAA/1,2,3,4,5/X=0Y=FUN(A,5)+FUN(A,5)WRITE(*,*)YENDFUNC
以扩大()为重点,形成便捷、通畅、高效、安全的综合交通运输体系。
施工合同文件中出现含糊不清或不一致时,施工合同专用备款的解释顺序应在( )。
施工成本分析就是根据会计核算、业务核算和( )提供的资料,对施工成本的形成过程和影响成本升降的因素进行分析。
下图是网络地址转换NAT的一个示例。根据图中信息,转换表中①和②处的内容依次应为()。
最新回复
(
0
)