首页
登录
职称英语
Space is a dangerous place, not only because of meteors (流星) but also becaus
Space is a dangerous place, not only because of meteors (流星) but also becaus
游客
2023-09-06
65
管理
问题
Space is a dangerous place, not only because of meteors (流星) but also because of rays from the sun and other stars. The【26】again acts as our protective blanket on earth. Light gets through, and this is【27】for plants to make the food which we eat. Heat, too, makes our environment【28】Various kinds of rays come through the air from outer space, but enormous quantities of radiation from the sun are【29】off. As soon as men leave the atmosphere they are exposed to this【30】and their spacesuits or the walls of their spacecraft, if they are inside, do【31】a lot of radiation damage.
Radiation is the greatest known danger to【32】in space. The unit of radiation is called "rem". Scientists have reason to think that a man can put up with far more radiation than 0.1 rein without being damaged; the figure of 60 rems has been agreed on. The trouble is that it is【33】difficult to be sure about radiation damage—【34】, and this will not be discovered until the birth of deformed children or even grandchildren. Missions of the Apollo flights have had to cross belts of high amounts of reins.【35】, we simply do not know yet how men are going to get on, when they spend weeks and months outside the protection of the atmosphere, working in a space laboratory. Drugs might help to decrease the damage done by radiation,【36】 [br]
Space is a dangerous place, not only because of meteors (流星) but also because of rays from the sun and other stars. The atmosphere again acts as our protective blanket on earth. Light gets through, and this is essential for plants to make the food which we eat. Heat, too, makes our environment endurable Various kinds of rays come through the air from outer space, but enormous quantities of radiation from the sun are screened off. As soon as men leave the atmosphere they are exposed to this radiation and their spacesuits or the walls of their spacecraft, if they are inside, do prevent a lot of radiation damage.
Radiation is the greatest known danger to explorers in space. The unit of radiation is called "rem". Scientists have reason to think that a man can put up with far more radiation than 0.1 rein without being damaged; the figure of 60 rems has been agreed on. The trouble is that it is extremely difficult to be sure about radiation damage—a person may feel perfectly well, but the cells of his or her sex organs may be damaged, and this will not be discovered until the birth of deformed children or even grandchildren. Missions of the Apollo flights have had to cross belts of high amounts of reins. So far, no dangerous amounts of radiation have been reported, but the Apollo missions have been quite short , we simply do not know yet how men are going to get on, when they spend weeks and months outside the protection of the atmosphere, working in a space laboratory. Drugs might help to decrease the damage done by radiation, but no really effective ones have been found so far
选项
答案
radiation
解析
转载请注明原文地址:http://tihaiku.com/zcyy/2990645.html
相关试题推荐
Theauthorofthereport______(对医院的问题非常了解)becausehehasbeenworkingtheref
MostpeoplethinkoflionsasstrictlyAfricanbeasts,butonlybecausethe
MostpeoplethinkoflionsasstrictlyAfricanbeasts,butonlybecausethe
[originaltext]Peopleoftenmissmealsbecausetheygetbusyoraretrying
MarsfascinatesscientistsbecauseofitssimilaritytoEarth,anditfasci
MarsfascinatesscientistsbecauseofitssimilaritytoEarth,anditfasci
MarsfascinatesscientistsbecauseofitssimilaritytoEarth,anditfasci
MarsfascinatesscientistsbecauseofitssimilaritytoEarth,anditfasci
MarsfascinatesscientistsbecauseofitssimilaritytoEarth,anditfasci
MarsfascinatesscientistsbecauseofitssimilaritytoEarth,anditfasci
随机试题
[originaltext]M:Ireallyappreciateyourfillingmeinonyesterday’slecture.
Earth:MeltingintheHeat?Glaciers
电动常开防火门的控制方式有手动控制、自动控制和机械应急三种。
甲、乙、丙到科技馆参加课外活动,甲每隔3天去一次,乙每隔5天去一次,丙每隔9天去
A.甘温 B.辛凉 C.苦寒 D.辛温 E.甘凉治疗外感风寒表证宜选用性
制度化教育建立的典型表现特征是( )。A.学校的产生 B.学制的建立 C.
下列教学目标中,属于《普通高中生物学课程标准(2017年版2020年修订)》中的
共用题干 AvalancheandItsSafetyAnavalanc
长江公司2020年有关持有待售类别的事项如下: (1)2020年3月1日,长江
某工程双代号网络计划如下图所示,计算工期是( )天。 A.17 B.18
最新回复
(
0
)