首页
登录
职称英语
Space is a dangerous place, not only because of meteors(流星)but also because
Space is a dangerous place, not only because of meteors(流星)but also because
游客
2024-05-10
3
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【B1】_____ again acts as our protective blanket on earth Light gets through, and this is【B2】_____ for plants to make the food which we eat. Heat, too, makes our environment【B3】_____. Various kinds of rays come through the air from outer space, but enormous quantities of radiation from the sun are【B4】_____ off. As soon as men leave the atmosphere they are exposed to this【B5】_____ and their spacesuits or the walls of their spacecraft, if they are inside, do【B6】_____ a lot of radiation damage.
Radiation is the greatest known danger to【B7】_____ 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 rem without being damaged; the figure of 60 rems has been agreed on. The trouble is that it is【B8】_____ difficult to be sure about radiation damage—【B9】______, 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 rems.【B10】______, 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,【B11】______ [br] 【B2】
选项
答案
essential
解析
转载请注明原文地址:https://tihaiku.com/zcyy/3591711.html
相关试题推荐
Adulteducationdevelopsfastrecentlypartlybecause______.[br]Themainpurp
Adulteducationdevelopsfastrecentlypartlybecause______.[br]Itcanhasin
Adulteducationdevelopsfastrecentlypartlybecause______.[br]TheAmerican
Adulteducationdevelopsfastrecentlypartlybecause______.[br]Whatissaid
Spaceisadangerousplace,notonlybecauseofmeteors(流星)butalsobecause
Spaceisadangerousplace,notonlybecauseofmeteors(流星)butalsobecause
Spaceisadangerousplace,notonlybecauseofmeteors(流星)butalsobecause
BecauseSouthAfricansaregenerallysobubbly(热情奔放的)andtalkative,silenc
BecauseSouthAfricansaregenerallysobubbly(热情奔放的)andtalkative,silenc
BecauseSouthAfricansaregenerallysobubbly(热情奔放的)andtalkative,silenc
随机试题
[originaltext]M:Beforeweplayagain,I’mgoingtobuyagoodtennisracket.
Myjobwastomakeclassroomobservationsandencourageatrainingprogramt
[originaltext]W:Don’tyouthinkit’smarvelousthatMaryhaswonthefirstpri
根据《建设工程安全生产管理条例》,县级以上人民政府负有建设工程安全生产监督管理职
某地级市的交通管理局为了治理本市交通拥堵,需要对本市的汽车销售情况、人们出行情况
有关小儿(不包括新生儿)脑脊液的正常值,正确的描述是A、蛋白0.2~0.4g/L
(2018年真题)为圆柱形,表面金黄色、绿黄色或棕黄色,有纵皱纹的是( )A.
(2018年真题)2018年3月21日,中共中央印发《深化党和国家机构改革方案》
M公司为增值税一般纳税人,销售和购买商品适用的增值税税率为13%,2020年度的
监理单位接受建设单位委托对工程项目实施全过程监理时,在设计准备阶段需要( )。
最新回复
(
0
)