首页
登录
职称英语
The oceans, which cover nearly three-quarters of Earth’s surface, remain lar
The oceans, which cover nearly three-quarters of Earth’s surface, remain lar
游客
2024-02-27
39
管理
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." [br] According to the text, the Slocum Glider will possibly be used to ______.
选项
A、change the occurrence patterns of underwater eddies
B、control storm formation and other weather development
C、show a vivid picture of the movement of the eddies
D、guide planes to fly over the eddy sections to avoid danger
答案
C
解析
由题干定位到原文末段首句“The gliders could also get through and follow previously unstudied phenomena such as small underwater eddies...”。
转载请注明原文地址:https://tihaiku.com/zcyy/3485976.html
相关试题推荐
Londonhasbeena【B1】______cityfornearly1,000years,andmanyofits【B2】
Londonhasbeena【B1】______cityfornearly1,000years,andmanyofits【B2】
Londonhasbeena【B1】______cityfornearly1,000years,andmanyofits【B2】
Londonhasbeena【B1】______cityfornearly1,000years,andmanyofits【B2】
Londonhasbeena【B1】______cityfornearly1,000years,andmanyofits【B2】
Londonhasbeena【B1】______cityfornearly1,000years,andmanyofits【B2】
Londonhasbeena【B1】______cityfornearly1,000years,andmanyofits【B2】
ManyaresurprisedtolearnthatAntarctica(南极)isnearlytwicethesizeof
ManyaresurprisedtolearnthatAntarctica(南极)isnearlytwicethesizeof
ManyaresurprisedtolearnthatAntarctica(南极)isnearlytwicethesizeof
随机试题
Allemployeesarerequiredtoensurethatthecomputersareturnedoffbefore___
TheHydrogenEconomyItseemslikeev
[originaltext]TheheadoftheUnitedStatescentralbanksayssheexpectst
影响个人、家庭保险需求的因素很多,其中不包括()。A.文化因素 B.
编者按语是一种依附于新闻报道或文稿的画龙点睛式的简短的编者评论,是新闻媒介的编者
流转税是以()为征税对象按流转额征收的各种税的总称A.物品B.商品C.非商
某理想气体分别进行如图2所示的两个卡诺循环:Ⅰ(abcda)和Ⅱ(a'b'c'd
下列选项中为安全隐患处理程序的是()A.备案整改复查结案 B.备案整改复查销
财务报表附注一般应包括的内容有()。A.企业的基本情况 B.财务报表的编制基础
动机产生的影响因素包括()。A、需要 B、情绪 C、诱因 D、内驱力
最新回复
(
0
)