首页
登录
职称英语
Initial voyages into space introduced questions scientists had never before
Initial voyages into space introduced questions scientists had never before
游客
2025-03-27
41
管理
问题
Initial voyages into space introduced questions scientists had never before considered. Could an astronaut swallow food in zero gravity? To keep things simple, astronauts on the Project Mercury ate foods squeezed out of tubes. It was like serving them baby food in a toothpaste container.
But these early tube meals were flavorless, and astronauts dropped too many pounds. "We know that astronauts have lost weight in every American and Russian manned flight," wrote NASA scientists Malcolm Smith in 1969. "We don’t know why." Feeding people in space was not as easy as it looked.
Floating around in space isn’t as relaxing as it might sound. Astronauts expend a lot of energy and endure extreme stresses on their bodies. Their dietary requirements are therefore different from those of their gravity-bound counterparts on Earth. For example, they need extra calcium to compensate for bone loss. ’A low-salt diet helps slow the process, but there are no refrigerators in space, and salt is often used to help preserve foods," says Vickie Kloeris of NASA. "We have to be very careful of that."
By the Apollo missions, NASA had developed a nutritionally balanced menu with a wide variety of options. Of course, all the items were freeze-dried or heat- treated to kill bacteria, and they didn’t look like regular food.
Today, the most elaborate outer-space meals are consumed in the International Space Station (ISS), where astronauts enjoy everything from steak to chocolate cake. The ISS is a joint venture between the U.S. and Russia, and diplomatic guidelines dictate the percentage of food an astronaut must eat from each country. NASA’s food laboratory has 185 different menu items, Russia offers around 100, and when Japan sent up its first crew member in 2008, about 30 dishes came with him. Due to dietary restrictions and storage issues, astronauts still can’t eat whatever they want whenever they feel like it.
In 2008, NASA astronaut and ISS crew member Sandra Magnus became the first person to try to cook a meal in space. It took her over an hour to cook onions and garlic in the space station’s food warmer, but she managed to create a truly delicious dish: grilled tuna (金枪鱼) in a lemon-garlic-ginger sauce---eaten from a bag, of course. [br] Which of the following is true about the early space meals?
选项
A、They had to be eaten from a bag.
B、They tasted better than they looked.
C、They could not make eating as easy as possible.
D、They were not nutritious enough for astronauts.
答案
D
解析
转载请注明原文地址:https://tihaiku.com/zcyy/4015184.html
相关试题推荐
Initialvoyagesintospaceintroducedquestionsscientistshadneverbefore
Initialvoyagesintospaceintroducedquestionsscientistshadneverbefore
Initialvoyagesintospaceintroducedquestionsscientistshadneverbefore
Beforethearrivaloftheinternet,computerfileswereexchangedviastorag
Beforethearrivaloftheinternet,computerfileswereexchangedviastorag
Beforethearrivaloftheinternet,computerfileswereexchangedviastorag
Beforethearrivaloftheinternet,computerfileswereexchangedviastorag
Beforethearrivaloftheinternet,computerfileswereexchangedviastorag
Directions:Thereare10questionsinthispartofthetest.Readthepassag
Directions:Thereare10questionsinthispartofthetest.Readthepassag
随机试题
______isMaugham’sbest-knownworkwhichisalsoregardedashisautobiographic
[originaltext]W:ProfessorBevan,howimportantismotivationforamanager?M:
《麦克白》的主题是()A.鞭挞野心 B.讴歌英雄主义 C.揭露社会的黑暗
根据标准贯入实验测得的累计锤击数N可估计()。A.砂土的密实度 B.天然地基
探诊检查引起慢性牙髓炎的深龋洞时,可以发现 A.洞底硬,不敏感 B.洞内探到
某研究者,为了验证氯霉素对伤寒的疗效,在408例伤寒病人中进行对照试验,其中25
房地产服务业可分为()。A:物业管理业 B:建筑业 C:房地产开发经营业
暑令感寒夹湿,症见发热头痛,恶寒无汗,胸闷烦恶,舌苔白腻,脉浮者,治宜选用(
体内缺铁初期的最早最可靠的诊断依据是A.血清转铁蛋白饱和度下降 B.血清总铁结
根据《中医药法》,关于医疗机构配制中药制剂的说法,错误的是A.医疗机构配制中药制
最新回复
(
0
)