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 space between the stars is filled with matter that interstellar conditions should prevent from coalescing into solid particl
The space between the stars is filled with matter that interstellar conditions should prevent from coalescing into solid particl
admin
2020-03-28
51
问题
The space between the stars is filled with matter that interstellar conditions should prevent from coalescing into solid particle. Yet surprisingly tiny frozen particles, referred to as interstellar grains, do develop in these spaces. These grains are formed out of chemical elements that are synthesized during thermonuclear fusion in stars and supernova explosions.
The study of interstellar grains has been hampered by the inaccessibility of naturally occurring specimens for use in laboratory experiments. To date, the only source of information about interstellar grains is the stellar electromagnetic radiation that reaches the Earth after passing through regions of space containing interstellar grains. By observing the wavelengths scattered and absorbed by the grains scientists have determined that a grain’s internal structure consists of a core composed of silicates (rocklike material) and a mantle composed entirely of organic compounds. It is hypothesized that each grain begins as a silicate “
seedling
” ejected from a mature star. Continuous physical and chemical evolution then occurs in the mantle formed around the seedling.
It can be inferred from the passage that the method currently used to analyze the structure of an interstellar grain could best be described is
选项
A、Unprecedented
B、Indirect
C、Comprehensive
D、Controversial
E、Unsound
答案
B
解析
根据第二段第一句可知,因为没法得到星际颗粒的标本,因此星际颗粒的研究方法都是间接的,选项B正确。
转载请注明原文地址:https://jikaoti.com/ti/EgLYFFFM
本试题收录于:
GRE VERBAL题库GRE分类
0
GRE VERBAL
GRE
相关试题推荐
Theauthorindicatesexplicitlythatwhichofthefollowingrecordshasbeenasourceofinformationinherinvestigation?The
Itcanbearguedthatmuchconsumerdissatisfactionwithmarketingstrategiesarisesfromaninabilitytoaimadvertisingatonl
Twodivergentdefinitionshavedominatedsociologists’discussionsofthenatureofethnicity.Thefirstemphasizestheprimordi
WhenA.PhilipRandolphassumedtheleadershipoftheBrotherhoodofSleepingCarPorters,hebeganaten-yearbattletowinrec
BetweentheeighthandeleventhcenturiesA.D.,theByzantineEmpirestagedanalmostunparalleledeconomicandculturalreviv
Althoughgeneticmutationsinbacteriaandvirusescanleadtoepidemics,someepidemicsarecausedbybacteriaandvirusesthat
ItappearsillogicaltosomepeoplethatWestGermany,whichbanssuchseeminglesserevilsaslawn-movingonSundays,stillhas
Contrarytopopularopinion,themovementtowardaserviceeconomyisleadingneithertolowerstandardsofliving,moreofanu
Almostallrecognizethatnon-scientistsaswellaslaymenareinterestedinsciences,yetscientistshavebeentryingtoclassi
随机试题
一般来说,缺少了曲轴位置信号,电子点火系将不能点火。()
汽车检测将实现真正的网络化(局域网),从而做到_______、_______、共享。
泄泻的证型有
在一起共同抢劫案中,M省A市人马某、宋某、周某在该省的B市内抢劫被抓获。人民检察院决定对本案提起公诉。
碾压混凝土坝是采用碾压土石坝的施工方法,使用干贫混凝土修建的混凝土坝,是混凝土坝施工的一种新技术。某拦河大坝采用该项施工技术。承包商在编制施工组织设计时,根据有关资料,结合现场地形地貌等条件,重点对下列几个方面进行分析和考虑:(1)料场的选择与布置;(
A公司与B公司均为增值税一般纳税人。2×19年9月,A公司向B公司销售一批商品。销售价款为1000万元,发生的增值税销项税额为130万元,双方约定B公司于2×20年3月1日支付货款。2×20年2月1日,双方针对上述债权债务的清偿事宜进行协商,下列协商的方
【2014.山东济宁】教师有下列情形之一的,由所在学校、其他教育机构或者教育行政部门给予行政处分或者解聘。()
描绘下列函数的图形:(1)y=e-(x-1)2;(2)y=x/1+x2.
InternetdatashowsthatAmericanyoungeradultshavebecometheprimarygroupmadaboutalteringtheirpersonalappearance.Onc
DearSirs,IamwritingtoyourofficetoattempttodeterminewhyIhaveencouragedsomanyobstaclestoreceivingmyproper
最新回复
(
0
)