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
考研
It is hard to track the blue whale, the ocean’s largest creature, which has almost been killed off by commercial whaling and is
It is hard to track the blue whale, the ocean’s largest creature, which has almost been killed off by commercial whaling and is
admin
2012-02-02
85
问题
It is hard to track the blue whale, the ocean’s largest creature, which has almost been killed off by commercial whaling and is now listed as an endangered species. Attaching radio devices to it is difficult, and visual sightings are too unreliable to give real insight into its behavior.
So biologists were delighted early this year when, with the help of the Navy, they were able to track a particular blue whale for 43 days, monitoring its sounds. This was possible because of the Navy’s formerly top-secret system of underwater listening devices spanning the oceans.
Tracking whales is but one example of an exciting new world just opening to civilian scientists after the cold war as the Navy starts to share and partly uncover its global network of underwater listening system built over the decades to track the ships of potential enemies.
Earth scientists announced at a news conference recently that they had used the system for closely monitoring a deep-sea volcanic eruption (爆发) for the first time and that they plan similar studies.
Other scientists have proposed to use the network for tracking ocean currents and measuring changes in ocean and global temperatures.
The speed of sound in water is roughly one mile a second—slower than through land but faster than through air. What is most important, different layers of ocean water can act as channels for sounds, focusing them in the same way a stethoscope (听诊器) does when it carries faint noises from a patient’s chest to a doctor’s ear. This focusing is the main reason that even relatively weak sounds in the ocean, especially low-frequency ones, can often travel thousands of miles. (283 words)
The deep-sea listening system makes use of______.
选项
A、the sophisticated technology of focusing sounds under water
B、the capability of sound to travel at high speed
C、the unique property of layers of ocean water in transmitting sound
D、low-frequency sounds traveling across different layers of water
答案
C
解析
本题属于细节题。尾段主要讲深海监听系统的工作原理:先说声的速度,“the speed of sound”,“What is most important”引出更为重要的原理:海水的不同层面形成声音的通道,就像听诊器把病人胸腔模糊的声音传到医生的耳中的原理一样,把声音聚在一起并据此给声音定位,“different layers of ocean water can act as channels for sounds,focusing them…”。所以选项C可以对等替换此部分,为本题答案。
转载请注明原文地址:https://kaotiyun.com/show/m3na777K
本试题收录于:
艺术硕士(艺术基础)题库专业硕士分类
0
艺术硕士(艺术基础)
专业硕士
相关试题推荐
阅读案例:“芬兰诺基亚的崛起”,并回答问题。案例:芬兰诺基亚的崛起移动电话(手机)设备产业是20世纪90年代成长最快的产业之一。诺基亚在手机销售市场中占支配地位。诺基亚的根基在芬兰,一个人们在谈论尖端技术公司时通常想不到的国家
2011年8月16日,200余媒体、400多粉丝齐聚北京,共同见证发烧友级重量手机小米手机的发布。雷军先极其详细地介绍了小米手机的参数和优点,在勾起人们兴趣之后临近结束之时,雷军用一张庞大醒目的页面公布了小米手机的价格:1999元。作为首款全球1.5G双
Ifyouknowexactlywhatyouwant,thebestroutetoajobistogetspecializedtraining.Arecentsurveyshowsthatcompanies
ForanincreasingnumberofstudentsatAmericanuniversities,Oldissuddenlyin.Thereasonisobvious;thegrayingofAmerica
Youmusthavebeentroubledbywhentosay"Iloveyou"becauseitisoneofthegreatestpuzzlesinourlife.Whatifyous
Nearlyall"speedreading"courseshavea"pacing"element—sometimingdevicewhichletsthestudentknowhowmanywordsaminut
Mostepisodesofabsent-mindedness—forgettingwhereyouleftsomethingorwonderingwhyyoujustenteredaroom—arecausedbya
Somepessimisticexpertsfeelthattheautomobileisboundtofallintodisuse.Theyseeadayinthenot-too-distantfuturewhe
Inthe1920sdemandforAmericanfarmproductsfell,asEuropeancountriesbegantorecoverfromWorldWarIandinstitutedaust
Accordingtotheairlineindustrystatistics,almost90%ofairlineaccidentsaresurvivableorpartiallysurvivable.Butpassen
随机试题
胃迷走神经切断术后常见并发症包括
麦门冬汤中麦门冬与半夏的用量比例是
青霉素过敏致血清病型反应,一般出现在用药后
图5—1—2所示结构的两杆面积和材料相同,在铅直力F作用下,拉伸正应力最先达到许用应力的杆是()。[2013年真题]
拟建某冶金企业年产钢200万t,工作制度为年工作365d,厂址地处丘陵地带,坡度在20°~30°,丘陵之间距离紧密。据调查,企业纳污水体全长约为128km,流域面积为1200km2,年平均流量为78m3/s,河宽为30~50m,水深为5~7m,枯水期为1
下列哪一项不是合理控制超大、特大城市人口和用地规模的举措?()
(2008年考试真题)采用限价委托方式要求经纪商必须帮助投资者以()。
非公开发行的公司债券应当向合格投资者发行,下列不属于合格投资者范围的是()。
公安部于2003年1月22日发布的加强公安机关内部管理的“五条禁令”规定:严禁参与赌博,违者予以辞退;情节严重的,予以开除。()
民溃事件与役人暴动
最新回复
(
0
)