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
2023-09-01
45
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] 【B6】
选项
答案
prevent
解析
转载请注明原文地址:https://tihaiku.com/zcyy/2975449.html
相关试题推荐
It’sveryhardtomakeitasapopstar______(因为你会面临很多竞争).becauseyouhavetogo
Kunzgaveupsoftwareengineeringmainlybecauseheearnedlessthanthoseinla
Kunzgaveupsoftwareengineeringmainlybecauseheearnedlessthanthoseinla
Kunzgaveupsoftwareengineeringmainlybecauseheearnedlessthanthoseinla
MostpeoplethinkoflionsasstrictlyAfricanbeasts,butonlybecausethe
MostpeoplethinkoflionsasstrictlyAfricanbeasts,butonlybecausethe
MoreAmericansaretakingupeducationafterretirementspartlybecause______.
MoreAmericansaretakingupeducationafterretirementspartlybecause______.
MoreAmericansaretakingupeducationafterretirementspartlybecause______.
[originaltext]DangerousoccupationstendtobeexcitingandWellpaid.They
随机试题
Wecanseehoweveryphilosopherreflectsthesociallifeofhisday.Plato
Peoplecanlosetheirhearingatanyagebeforetheyareborn,asinfants,d
Mostearthquakesoccurwithintheupper15milesoftheearth’ssurface.But
Americannewspapersarereportingwhatsomepeoplefearistheslowdeathof
患者,男性,43岁,因肺炎入院治疗。患者主诉右侧胸痛,护士可指导患者休息时采取的
施工招标的形式有()。Ⅰ、公开招标;Ⅱ、邀请招标;Ⅲ、议标;Ⅳ、指定招标A.
用于显示TCP连接、计算机正在监听的端口、以太网统计信息的命令是()。A.i
组距数列中每组上限是指()。A.每组的最小值 B.每组的最大值 C.每组的
下列各项中,除哪项外均属八正散的组成药物()A.瞿麦萹蓄 B.茯苓
根据现行国家标准《建筑设计防火规范》(GB50016),下列民用建筑防火间距设计
最新回复
(
0
)