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
Electric Backpack Backpacks (背包) are convenient. They can hold your books, your lunch, and a change of clothes, leaving your
Electric Backpack Backpacks (背包) are convenient. They can hold your books, your lunch, and a change of clothes, leaving your
admin
2011-01-05
77
问题
Electric Backpack
Backpacks (背包) are convenient. They can hold your books, your lunch, and a change of clothes, leaving your hands free to do other things. Someday, if you don’t mind carrying a heavy load, your backpacks might also power your MP3 player, keep your cell phone running, and maybe even light your way home.
Lawrence C. Rome and his colleagues from the University of Pennsylvania in Philadelphia and the Marine Biological Laboratory in Woods Hole, Mass. , have invented a backpack that makes electricity from energy produced while its wearer walks. In military actions, search-and-rescue operations, and scientific field studies, people rely increasingly on cell phones, global positioning system (GPS) receivers, night-vision (夜视镜) goggles (护目镜), another battery powered devices to get around and do their work. The backpack’s electricity-generating feature could dramatically reduce the amount o{ a wearer’s load now devoted to spare batteries (备用电池), report Rome and his colleagues in the Sept. 9 Science .
The backpack’s electricity-creating powers depend on springs used to hang a cloth pack from its metal frame. The frame sits against the wearer’s back, and the whole pack moves up and clown as the person walks. A gear mechanism converts vertical movements of the pack to rotary motions of an electrical generator, producing up to 7.4 watts.
Unexpectedly, tests showed that wearers of the new backpack alter their gaits in response to the pack’s oscillations, so that they carry loads more comfortably and with less effort than they do ordinary backpacks. Because of that surprising advantage, Rome plans to commercialize both electric and non-electric versions of the backpack.
The backpack could be especially useful for soldiers, scientists, mountaineers, and emergency workers who typically carry heavy backpacks. For the rest of us, power-generating backpacks could make it possible to walk, play video games, watch TV, and listen to music, all at the same time. Electricity-generating packs aren’t on the market yet, but if you do get one eventually, just make sure to look both ways before crossing the street!
What is the most important feature of the backpack invented by Lawrence C Rome and his colleagues?
选项
A、It produces electricity for electronic devices while the wearer walks.
B、It can be used as cell phones, GPS in the military actions or field studies.
C、It is small and convenient.
D、It is light and easy to carry.
答案
A
解析
转载请注明原文地址:https://kaotiyun.com/show/X6Qd777K
本试题收录于:
职称英语理工类C级题库职称英语分类
0
职称英语理工类C级
职称英语
相关试题推荐
Theseprogrammesareofimmensevaluetooldpeople.
SmartWindowWindowsnotonlyletlightintocutdownanelectricityuseforlighting,butthelightcomingthroughthewin
Ournewhouseisonthefirstfloor.
Accordingtothepassage,killinginsectsandbacteriapresentinfoodsbyirradiatingisnotcompletelyapprovedbytheUSgove
Thequestion"Areyouamanoramouse?"reallymeanstoaskwhetheryoubelieveThelastparagraphtellsusthatwhenyouare
FDAhasapprovedtheplanofusingHIVtocurecancerinhumans.TheHIVvirusisanexcellentwarriortofightthebody’simmu
Thetraditionalpaintingsare(exhibited)onthesecondfloor.
Thespecial-effectsrevolutionbeganinthemid1980swithStarWars.DennisMurenstartedhisschoolingataveryearlyage.
TheConquestofDistanceIn1848,pioneerswhocrossedtheAmericancontinentintheirwagonsmadethetripin109days.
RescuePlatformIntheaftermathoftheterroristattacksontheWorldTradeCenter,securityexpertsaretryingtodevelop
随机试题
睡眠有两种不同的时相状态,分别为______和_______。
A、I型超敏反应B、Ⅱ型超敏反应C、Ⅲ型超敏反应D、Ⅳ型超敏反应E、非超敏反应过敏原吸附试验可用于诊断
根据《建设工程安全生产管理条例》,安全警示标志必须符合()。
(2004)“粗野主义”的名称最初是由哪个国家的哪位建筑师提出的?
下列可以作为保证人的有()。
在一起共同抢劫案件中,某省甲市人马某、宋某、周某在该省的乙市内抢劫被抓获,人民检察院决定对本案提起公诉。本案中,如果马某、宋某聘请了辩护律师,则人民法院对于没有委托辩护人的周某可以采取的做法有哪些?()
马克思主义解决哲学基本问题的出发点是()。
2011年,某市工业企业(规模以上,下同)用水总量193.27亿立方米.比上年减少1.66亿立方米。其中,取水总量41.26亿立方米,增加0.57亿立方米;河湖海冷却水86.25亿立方米,增加1.09亿立方米。2011年该市工
两条平行直线之间的距离为()
A、Sheseldomreadsbooksfromcovertocover.B、Sheisinterestedinreadingnovels.C、Shereadonlypartofthebook.D、Shewas
最新回复
(
0
)