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
According to the speaker, what do people often think about astronomers?
According to the speaker, what do people often think about astronomers?
admin
2013-10-11
38
问题
According to the speaker, what do people often think about astronomers?
Most people think of astronomers as people who spend their time in cold observatories peering through telescopes every night. In fact, a typical astronomer spends most of his or her time analyzing data and may only be at the telescope for a few weeks of the year. Some astronomers work on purely theoretical problems and never use a telescope at all.
You might not know how rarely images are viewed directly through telescopes. The most common way to observe the skies is to photograph them. The process is very simple. First a photographic plate is coated with a light-sensitive material. The plate is positioned so that the image received by the telescope is recorded on it. Then the image can be developed, enlarged and published so that many people can study it.
Because most astronomical objects are very remote, the light we receive from them is rather feeble. But by using a telescope as a camera long-time exposures can be made.
In this way, objects can be photographed that are a hundred times too faint to be seen by just looking through a telescope.
选项
A、To spend less time at their telescopes.
B、To overcome the problem of weak light.
C、To take more photographs.
D、To photograph astronomical objects without using a telescope.
答案
B
解析
转载请注明原文地址:https://kaotiyun.com/show/8zGK777K
0
专业英语四级
相关试题推荐
TheReviewofEuropeanHistoryWritingforanhistoricalseriesistricky,andtheoutcomeisnotalwaysasuccess.Thebest
ControlanUniversityLogisticNumber,BoycottSchoolFeesRiseOverthelasttwodecades,collegesanduniversitiesdoubled
Fewpeoplerealizehowrichthatareais.Itisalandoftreasure______treasure.
WhichofthefollowingisNOTaresultoftheunderseaearthquakeinJapan?
Whichofthefollowingstatementsabout"appleofdiscord"isNOTtrue?
WriteonANSWERSHEETTWOanoteofabout50460wordsbasedonthefollowingsituation:Youforgottoreturnthebooklastwe
Today,California’spublicschoolsareadisaster.【C1】______bydysfunctionanddisrepair,theyrankatthebottomofthecountry
Thefootballplayerwasnotnominatedbythecommittee,______notverypopularwithallitsmembers.
Plantscanabsorbthecarbondioxidethroughtheir______duringthesunlighthoursandproduceoxygenwhichhumanbeingsneedt
Heis______aballplayer.
随机试题
HIV感染和致病的主要特点是病毒能选择性地侵犯_________细胞,主要是_________细胞。
在定性的基础上,依据开发需求确定注水井及每个层段配注水量就称为()注水。
综合反映纽约股票市场股票价格变动的指数中,最有代表性的是()
患者,女,30岁。全身水肿、尿少4周。体格检查:血压140/90mmHg,大量腹水。化验:尿蛋白(++++),24小时尿蛋白总量8.1g,尿红细胞5~8/Hp,白细胞:4~6/HP。血红蛋白:101g/L,血白蛋15g/L,血肌酐13μmol/L,A
A.急性中毒B.慢性中毒C.致癌作用D.致畸作用E.致突变作用
片剂的常规检查项目有()
证券公司集合资产管理业务制度不健全,净资本或其他风险控制指标不符合规定,或者违规从事集合资产管理业务的,中国证监会及其派出机构应当依法责令其限期改正,并可以采取下列()监管措施。Ⅰ.责令增加内部合规检查次数并提交合规检查报告Ⅱ.对公司高级管理人
根据《商业银行风险监管核心指标》,我国商业银行的核心资本充足率最低为()。
为了打击滥用食品添加剂的行为。市政府多个部门成立联合小组。你作为牵头单位的联络员,你准备怎么做好服务工作?
SharingEconomicLossesThroughInsuranceEachminuteofthedayornight,everyonefacesapossiblefinancialloss.Ahome
最新回复
(
0
)