The atmosphere protects the earth. What is the atmosphere made of? A. Gas and dust B. Water and fire C. Earth and moon D. Stars and gas 相关知识点: 试题来源: 解析 A。本题考查对大气层组成的了解,大气层由气体和尘埃组成。B 选项水和火不对;C 选项地球和月亮不对;D 选项星星和气体不...
What gas is a human-made pollutant in the lower (surface) atmosphere but a natural and beneficial gas in the stratosphere? (a) CO2 (b) CH4 (c) O3 (d) CFCs (e) N2O Gases: Gases are substances in which part...
Curiosity is part of human nature. Children are famous for wanting answers to tons of questions. Books and TV shows often rely on curiosity. People keep reading or watching because they want to find out what happens. ...
What is the eye made of? What are diamonds made from? What is biofuel made of? What are gas lasers used for? What is laughing gas? What greenhouse gas is produced by burning fossil fuels? Most arson fires are produced through what?
So could it be that Earth really is unique? All living things on Earth are made of the same building blocks, long carbon-based molecules.所以地球真的是独一无二的吗？地球上所有的生物都有着相同的组成成分，即长碳基分子。Scientists now think that a large proportion of these molecules came from...
However, as corn starch is derived from the grains of corn, it competes with human and animal food supply systems, possibly making corn more expensive. So, while it has excellent properties for packaging certain products, you might still prefer to opt for a different pla...
8. A) Find out where is Jimmy. 9. B) He was working on a project with Jimmy. 10. C) He was involved a traffic accident. 11. D) He wanted to conceal something from his parents. 12. B) Shopping online. 13. D) G...
结果1 题目The glass is made of silica. What is glass? A. A liquid B. A gas C. A solid D. A powder 相关知识点: 试题来源: 解析 C。玻璃是由硅石制成的,玻璃是固体。选项 A 液体错误;选项 B 气体错误;选项 D 粉末错误。反馈 收藏 ...
In that sense, Earth is probably unique. Although we may detect some life elsewhere, it will necessarily be completely different.从这个意义上说，地球可能是独一无二的。虽然我们可能会在其他地方发现一些生命，但那肯定是完全不同的。It was this mind-blowing series of improbable events that made Earth...
This term includes the parallel concepts of Industry 4.0 and the smart factory. In smart factories, the production environment is run with minimal human intervention using new industrial manufacturing technologies. Sensors detect equipment issues before failure to avoid costly downtime. Additive ...