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
87
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.
【C8】______
选项
答案
in
解析
转载请注明原文地址:https://www.kaotiyun.com/show/MDKd777K
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
Whatistheproblem?
Whatisthewomanbuying?
A、 B、 C、 CItalwaysbeginsafewminuteslateanswerswhenwilltheperformancebegin.Choice(A)confusesthes
A、 B、 C、 CSheonlyreadsbusinessmagazinesanswerswhichmagazinesdoessheread.Choice(A)usesthewordmagazi
Whattypeofbusinessisbeingadvertised?
A、 B、 C、 A题干问的是软件是不是用全价买的。对这类问题要用Yes/No开头的句子来回答。所以很容易选出(A)“不,正在打折”是正确答案。(C)是为了混淆software中的soft和与之意义相反的harder而设
Whatpositionarethecandidatesapplyingfor?
A、 B、 C、 C当问句是以when开头的时候,要用表示时间的词进行回答。(A)用来回答以why开头的问句。(B)是利用application的动词形式apply设下的陷阱。所以正确答案是(C)。
FinancialManagement:thefactorsinvolvedinmaintainingahealthycashflowinabusiness
•Youwillhearabusinesspresentationabout3simplesellingtactics.•Asyoulisten,forquestions1—12,completethenotes,
随机试题
中共十七大指出,改革开放以来我国取得一切成绩和进步的根本原因是()
判断年龄的依据有哪些?
施工总结由()负责。
2015年3月12日,甲建设单位与乙施工单位签订了一份施工合同。2015年5月22日,乙施工单位在对某处进行施工时,既没有设置明显标志,又未采取安全措施,李某不小心掉进了施工现场的基坑中,造成腿部受伤,花去医疗费8000元。李某多次找该项目的建设单位、施
根据GB/T24001(中国环境管理体系)-IS014001标准的应用原则,在组织的管理体系中,环境管理体系()。
当系统各元件输入输出特性是线性特性,系统的状态和性能可以用线性微分(或差分)方程来描述时,则称这种系统为()。
增减注册资金的纳税人,不需要办理变更税务登记。( )
下列立法中,属于程序立法的有()。
下列属于公安专业工作的有()。
A、Togivestudentsfairchancesofusingthecomputers.B、Tolimitthenumberofstudentswhoarewaitinginline.C、Toreduces
最新回复
(
0
)