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
The oceans, which cover nearly three-quarters of Earth’s surface, remain largely unexplored because of their vastness and inacce
The oceans, which cover nearly three-quarters of Earth’s surface, remain largely unexplored because of their vastness and inacce
admin
2010-07-24
59
问题
The oceans, which cover nearly three-quarters of Earth’s surface, remain largely unexplored because of their vastness and inaccessibility to us air breathers. Webb Research of East Falmouth, Massachusetts, hopes to open up much of that mystery field with a new underwater vehicle that is pushed ahead solely by the ocean itself, so it can potentially study the watery depths for years at a time. Such long-lasting detectors may someday form fleets that provide up-to-minute data for weather forecasting.
In the past, such autonomous underwater vehicles, or AUVs, have been battery powered and therefore required frequent recharges that limited their distance and depth of travel. Webb’s Slocum glider(滑翔机) hopes to solve this problem. "We conceived of a thermally powered engine to get the energy from the colder deep water of the ocean and the shallower warm water," Clayton Jones, an engineer at Webb Research, explains. "We picked out a material that undergoes a state change between those two temperatures in the ocean." When cold, this form-shifting substance is a compact solid. When warm, it expands and becomes a less dense liquid. The material’s expansion in warmer waters charges an internal mechanism that acts like stored power to control its buoyancy: by pumping mineral oil in and out of an external air bag, it alters its volume but maintains its weight. "The glider takes up more volume and becomes lighter than the water around it--less dense," Jones says.
Scientists can also fit the Slocum glider with a variety of different sensory equipment and Global Positioning Systems. Each time it surfaces, it can raise its tail antenna(天线) to transmit data to and receive instructions from researchers sitting comfortably in their cozy offices. The glider will have its first test in salt water at the end of this September.
The gliders could also get through and follow previously unstudied phenomena such as small underwater eddies (漩涡), which are vital to understanding water transport and heat flow in the ocean and therefore play an important role in storm formation and other weather development. "We have all these data snapshots(快照) from floats that just flow with the deep ocean current," Jones says. "To be able to fly through eddy sections, then transport with the whole eddy itself as it moves through the ocean, would be a very nice phenomenon to take a look at."
Which of the following is true about the newly-designed AUV?
选项
A、It has never been used in sea exploration up to now.
B、It rises and falls very fast in deep sea in a straight line.
C、The power charging has to be done when it is not moving.
D、It is able to send and receive signals under deep water.
答案
A
解析
由题干中的the newly-designed AUV以及四个选项定位到原文第三段相关细节处。
转载请注明原文地址:https://kaotiyun.com/show/ObN7777K
0
大学英语四级
相关试题推荐
A、Nearly7million.B、Nearly17million.C、Nearly70million.D、Nearly77million.C
A、Childrenacquiredtheinformationtheyneededbydirectexperience.B、Childrentaughtoneanotherinsmallsupervisedgroups.
A、Adviceaboutlandscaping.B、Hintsaboutsavingtobuyahouse.C、Photographsofthehomesoffamouspeople.D、Plansforhouses
LoveAroundtheWorldItwasanunsettingnightattheAfricanbarandRichardBlaine,37,wasespeciallynervous.Clients
A、Becauseitisbetterthanotherfoods.B、Becauseittastesgood.C、Becauseitprovidescomfortandpleasure.D、Becauseitserv
OurformerforeignteacherwasayoungmanwhocamefromEngland.Hewasa【B1】______personwhodidnottalkmuchtostrangers,
OurformerforeignteacherwasayoungmanwhocamefromEngland.Hewasa【B1】______personwhodidnottalkmuchtostrangers,
Mostparents,Isuppose,havehadtheexperienceofreadingabedtimestorytotheirchildren.Andtheymusthave【C1】______how
A、Shehasbeenwaitingfortheman.B、Shewillstartanewjobthenextday.C、Shedoesnotknowifshegotthejob.D、Shedoes
FrogWhenwasthelasttimeyousawafrog?Chancesare,ifyouliveinacity,youhavenotseenoneforsometime.Evenin
随机试题
九味羌活汤的功用是
A.百会、风池、太冲、内关B.攒竹、阳白、四白、颧髎C.百会、安眠、神门、三阴交、照海、申脉D.列缺、合谷、大椎、太阳、风池E.列缺、尺泽、中府、定喘眩晕的针灸处方为()
静脉系统成为外周的血液贮存库,主要是由于
印堂的定位是( )。胆囊穴的定位是( )。
男性充盈性尿失禁的最常见原因是
我国某新建电厂一期安装两台200MW机组,采用发电机一变压器单元接线接入厂内220kV屋外中型配电装置,配电装置采用双母线接线。在配电装置架构上装有避雷针进行直击雷保护,其海拔高度不大于1000m。主变压器中性点可直接接地或不接地运行,配电装置设计了以水平
一种危险物具有多种事故形态,且它们的事故后果相近,则按统计平均原理估计事故后果。这种评价事故后果的原则是()。
按照《建设工程质量管理条例》的规定,建设单位在领取施工许可证或者开工报告(),应当按照国家有关规定办理工程质量监督手续。
《中华人民共和国义务教育法》规定,具体负责义务教育实施工作的是()。
A、Thepolicewillbetherewithteargas.B、Itwilllastalmost11hourstomorrow.C、Itwillbeheldonthecampus.D、Cleo’ssis
最新回复
(
0
)