首页
登录
职称英语
It is hard to track the blue whale, the ocean’s largest creature, which has
It is hard to track the blue whale, the ocean’s largest creature, which has
游客
2024-10-29
9
管理
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 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 does when it carries faint noise from a patient’ s chest to a doctor’ s ear. This focusing is the main reason why even relatively weak sounds in the ocean, especially low-frequency ones, can often travel thou- sands of miles. [br] 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 travelling across different layers of water
答案
C
解析
文章的最后一段讲述“the deep-sea listening system"的工作原理,其中讲到“What is most important,different layers of ocean water can act as channels for sounds…”,由此可见,这一系统就是利用了在传送声音方面"layers of ocean water"的独特特性,因此,C 是正确答案。
转载请注明原文地址:https://tihaiku.com/zcyy/3821842.html
相关试题推荐
Certainlynocreatureintheseaisodderthanthecommonseacucumber.All
Certainlynocreatureintheseaisodderthanthecommonseacucumber.All
_______NewYorkCityisAmerica’slargestcity,itisnotthecapitalofNewYo
Itishardtotrackthebluewhale,theocean’slargestcreature,whichhas
Itishardtotrackthebluewhale,theocean’slargestcreature,whichhas
Itishardtotrackthebluewhale,theocean’slargestcreature,whichhas
ThelibraryofcongressinWashington,D.C.,which【C1】______thelargestco
ThelibraryofcongressinWashington,D.C.,which【C1】______thelargestco
ThelibraryofcongressinWashington,D.C.,which【C1】______thelargestco
ThelibraryofcongressinWashington,D.C.,which【C1】______thelargestco
随机试题
(1)Someoftheadvantagesofbilingualismincludebetterperformanceattasks
Therehasbeenmuchchatteraboutbankloanstolocalgovernments’financing
庙会(templefair)是中国一种传统的节日活动。它源于古代人们的祭祀仪式(sacrificialceremony),逐渐演变成物品交流的集市和
效益审计中,将被审计单位的管理活动与同类先进单位相比,并借鉴其经验的分析方法是:
血瘀致痛的特点是()A.胀痛 B.刺痛 C.重痛 D.空痛 E
(2018年真题)资产管理行业对社会和市场经济的作用不包括()。A.为市场
单个境外投资者通过合格投资者持有一家上市公司股票的,持股比例不得超过该公司股份总
我国《刑法》第307条第1款规定:“以暴力、威胁、贿买等方法阻止证人作证或者指使
(2019年真题)关于刑法解释,下列说法正确的是?A.将虐待罪的对象“家庭成员”
影响保温材料导热系数的因素中,说法正确的是()。A.表观密度小,导热系数大;孔
最新回复
(
0
)