首页
登录
职称英语
Comets are now known to contain twice as many atoms of deuterium to
Comets are now known to contain twice as many atoms of deuterium to
游客
2025-02-22
8
管理
问题
Comets are now known to contain twice as many atoms of deuterium to
each atom of ordinary hydrogen found in seawater. Scientists have also
discovered that meteorites could not solely have delivered the water in the
Line ocean, for then the earth’s atmosphere would contain nearly 10 times as much
(5) xenon as it actually does, given that meteorites carry excess xenon. Hence, the
best model for the source of the oceans at the moment is a combination of water
derived from comets and water caught up in the rocky body of the earth as it
formed. This mixture satisfies both the xenon and deuterium problem, the
latter especially if the rocky material out near the earth’s present orbit
(10) collected some regularly composed local water from the solar nebula before they
accreted to form the earth. New laboratory studies have indicated that the
water vapor in the solar nebula would have had a low enough proportion of
deuterium to complement the excess deuterium found in comets. [br] According to the passage, scientists have concluded which of the following from the discovery of the large amount of deuterium found in comets?
选项
A、Comets do not contain enough deuterium to have solely created the Earth’s oceans.
B、Given the ratio of deuterium to ordinary hydrogen in seawater, comets cannot have contributed to the Earth’s oceans.
C、It is likely that comets contain less Xenon than meteorites do.
D、Given the low level of deuterium in the waters of Earth’s oceans, comets cannot be its sole source.
E、Comets now play a greater role in the creation of the Earth’s oceans than was previously thought.
答案
D
解析
转载请注明原文地址:https://tihaiku.com/zcyy/3967503.html
相关试题推荐
Cometsarenowknowntocontaintwiceasmanyatomsofdeuteriumto
Cometsarenowknowntocontaintwiceasmanyatomsofdeuteriumto
Skincontainsmillionsofsensoryreceptorswhichinformthebrain,throughelec
Althoughitdoescontainsomepioneeringideas,onewouldhardlycharacterizeth
Theconclusionofsuchavastandcomplexbookshouldhavecontaineda(i)______
Themagazinearticlediscussingthegovernor’sfinancialdealingscontained(i)_
InJapaneseaesthetics,especiallybutnotonlyinNoh,beautycontainstheidea
Theskinofthepoisondartfrogcontainsdeadlypoisonscalledbatrachotoxins.
TheNationalArchivescontaininformationso______thatresearchershavebeenk
Astronomerswhostudyplanetformationoncebelievedthatcomets—becausethe
随机试题
[originaltext]Host:InNewYorktoday,aprestigiousbusinessresearchgroupa
Ourworldisfilledwithsoundsweneverhear.Thehumanauditory(听觉的)rangeis
InAmericaalone,tippingisnowa$16billion-a-yearindustry.Consumersac
自2018年5月1日起,以下产品适用10%低税率的有( )。A、玉米胚芽 B、
消防管道工程中,水枪喷嘴直径有( )。A、10mm B、13mm
董事会对有效的风险管理承担最终责任,履行的风险管理职责是()。 Ⅰ.确定公司
关于Ⅰ型糖尿病的叙述,错误的是( )。A.胰岛细胞的破坏 B.胰岛素绝对不足
未配置双套母差保护的变电站,在母差保护停用期间应采取相应措施,.严格限制母线侧隔
为信息披露义务人履行信息披露义务出具专项文件的保荐机构、证券服务机构及其人员,违
最新回复
(
0
)