首页
登录
职称英语
[originaltext] Most people think of astronomers as people who spend their ti
[originaltext] Most people think of astronomers as people who spend their ti
游客
2023-07-30
51
管理
问题
Most people think of astronomers as people who spend their time in cold observatories peering through telescope every night. In fact, a typical, astronomer spends most of his or her time analyzing data and may only be at the telescope a few weeks of the year. Some astronomers work on purely theoretical problems and never use a telescope at all. You night 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 lightsensitive material. The plate is positioned so that the image received by the telescope is recorded on it. Then, the image cam he 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 tm faint to be seen by just looking through a telescope.
选项
A、To overcome the problem of weak light.
B、To take more photographs.
C、To photograph astronomical objects without using a telescope.
D、To spend less time at their telescopes.
答案
A
解析
转载请注明原文地址:https://tihaiku.com/zcyy/2882861.html
相关试题推荐
[originaltext]W:I’vejustreadacuriousfact.Didyouknowthatpeoplewhosp
[originaltext]W:I’vejustreadacuriousfact.Didyouknowthatpeoplewhosp
[originaltext]M:Thenwhydidyouapplyforthisjob?W:That’sbecauseofthe
[originaltext]M:Thenwhydidyouapplyforthisjob?W:That’sbecauseofthe
[originaltext]M:Thenwhydidyouapplyforthisjob?W:That’sbecauseofthe
[originaltext]M:Thenwhydidyouapplyforthisjob?W:That’sbecauseofthe
[originaltext]M:Thenwhydidyouapplyforthisjob?W:That’sbecauseofthe
[originaltext]Manyuniversitystudentsdislikestudyinghistorybecausetherei
[originaltext]Manyyearsagotherelivedaveryrichmanwhowantedtodosomet
[originaltext]Manyyearsagotherelivedaveryrichmanwhowantedtodosomet
随机试题
20oftheworld’stopeconomiespromisedtohelpIraqloweritsdebtandto
InChina,thelearningofEnglishusuallytakesplaceinclassrooms,withthest
OnehundredandthirteenmillionAmericanshaveatleastonebank(36)______
[originaltext]W:Whatdidyouthinkaboutthemovie?M:Well...IthinkHarryP
2007年7月15日,某亚麻厂正在生产的梳麻车间、前纺车间和准备车间的联合厂房
下列哪项不是新生儿甲状腺功能减低症的特点A.神经及动作反应迟钝 B.常为早产儿
下列没有行气功效的中药是A:延胡索B:五灵脂C:姜黄D:乳香E:川芎
A.内源性纤溶的激活物B.丝氨酸蛋白酶抑制物C.外源性纤溶的激活物D.抗血友病球
肾脏调节血液pH是通过A.Cl的重吸收B.HCO的重吸收C.Na-K碱交换D.排
只适合用于室性心动过速治疗的药物是A、奎尼丁 B、胺碘酮 C、索他洛尔 D
最新回复
(
0
)