首页
登录
职称英语
On March 18,1965, Leonov, the Russian astronaut, walked in outer space for t
On March 18,1965, Leonov, the Russian astronaut, walked in outer space for t
游客
2023-07-20
76
管理
问题
On March 18,1965, Leonov, the Russian astronaut, walked in outer space for the first time. Several months later, a similar feat was performed by the first American astronaut. Both of these space walkers had spent months previous to their flights learning how to control their movements under the strange conditions which exist in space. Wearing their thick space suits, they learned to deal with an environment where there is neither weight nor gravity, neither up nor down.
We don’t realize how much we depend on the earth’s gravity until we are deprived of it. Then our feet no longer stay on the ground; we float around in the air, the slightest touch may send us drifting off in the opposite direction.
In the laboratories where astronauts are trained for their journeys, they are subjected to conditions that resemble those of flight. It takes time for them to prepare for the great changes that occur in space. When the spaceship leaves the earth at tremendous speed, the astronauts feel as if they are being crushed against the spaceship floor. Later, when they leave the zone of the earth’s gravitation, they are unable to stay in one place. Simple actions, such as eating and drinking, become very difficult to perform. You may get an inkling of what the astronauts have to deal with if you try to drink a glass of water while standing on your head or while just lying down.
Tremendous speeds must be attained to reach other planets in a reasonable time. If spaceships were launched from space, the absence of weight would permit the ships to be launched with great speed at reduced pressures. To illustrate this point, remember how strong the wind feels if we are traveling fast in a car, then imagine a car traveling through an area where there is no wind. The windless condition is comparable to the condition in outer space. [br] What helps astronauts to float in the space?
选项
答案
Gravity
解析
细节题。在文章的第二段,作者明确告知宇航员漂浮的原因是失重,即没有了地球引力.
转载请注明原文地址:https://tihaiku.com/zcyy/2853010.html
相关试题推荐
Thenaturalistwalkedonfor______twentykilometersonanemptystomach.A、more
It’sclearthatherpaintingis______byPicasso,whoisthegreatestRussianp
OnMarch18,1965,Leonov,theRussianastronaut,walkedinouterspacefort
OnMarch18,1965,Leonov,theRussianastronaut,walkedinouterspacefort
OnMarch18,1965,Leonov,theRussianastronaut,walkedinouterspacefort
Asshewalkedroundthehugedepartmentstore,Edithreflectedhowdifficult
Asshewalkedroundthehugedepartmentstore,Edithreflectedhowdifficult
Asshewalkedroundthehugedepartmentstore,Edithreflectedhowdifficult
Asshewalkedroundthehugedepartmentstore,Edithreflectedhowdifficult
Asshewalkedroundthehugedepartmentstore,Edithreflectedhowdifficult
随机试题
[img]2011q3/ct_ehaz20116_ehareads_0060_20117[/img]BRIEFDESCRIPTIONOFACCI
Hersuggestionthateverybody()wasnotappreciated.A、singasongB、sangasong
使用6mm厚钢化玻璃,其最大使用面积不应超过( )。A.1.5m2 B.3.
交易能否顺利达成,( )是关键的环节。A、买方代理人的信息收集 B、确定
闭合性损伤包括A.擦伤 B.砍伤 C.挫伤 D.撕脱伤 E.火器伤
你工作干得并不好,领导却让你当典型,你怎么办?
拉美西斯二世
上市公司发行股份的价格不得低于本次发行股份购买资产的董事会决议公告日前()个
某机电安装公司承建一个石化项目的通风空调工程与设备安装工程,施工项目包括:地下车
《立法法》规定,同一机关制定的法律、行政法规、地方性法规、自治条例和单行条例、规
最新回复
(
0
)