POST a QUESTION or COMMENT about the constituents of air: concentrations of gases in airGases that make up outdoor air: this article provides a table of the components in outdoor air - a list of the various gases found in air by percentage....
根据最后一段最后一句“Be-cause exercise requires faster, deeper breathing, itmay make the symptoms worse."可知,当人们运动时,症状最明显,选项中只有D项是运动状态。 结果三 题目 __Air pollution is made up of many kinds of gases, __droplets (小水滴) __and particles that reduce __the quality ...
Primary pollutantsare those gases or particles that are pumped into the air to make it unclean. They include carbon monoxide from automobile (cars) exhausts and sulfur dioxide from the combustion of coal. Secondary pollutants:When pollutants in the air mix up in a chemical reaction, they form a...
The steam is a kind of gas. The air that you breathe is a mixture of gases. We can't usually Gases see the gas but sometimes we can feel it when it moves. For example, on a windy day, we can feel the air is moving.Things can change from one state to another when we make the...
The meaning of AIR is the mixture of invisible odorless tasteless gases (such as nitrogen and oxygen) that surrounds the earth; also : the equivalent mix of gases on another celestial object (such as a planet). How to use air in a sentence. Synonym Discu
Clean air is only made up of nutrition,oxygen and water.Our country has been industrialized;our cities have grown and traffic has increased.For these reasons there has come an increase in the number of by products released into the air,such as particles from burning fuels and poisonous gases ...
With these development there has come an increase in the number of by-products released into the air, such as particles(细粒)from burning fuels and poisonous gases from chemical reactions. These gases become pollutants. Air pollution has a bad effect on the earth and our environment. Air ...
n 1 [U] mixture of gases surrounding the earth and breathed by all land animals and plants 空气 Let's go out for some fresh air. 咱们出去呼吸点儿新鲜空气吧.2 [U](a) the earth's atmosphere; open space in this 大气; 天空 the birds of the air 天空的鸟 be in the open ...
Wherever you go and whatever you do, you are always surrounded by a sea of gases that we call air. If there are impurities in the air, they may be absorbed by our bodies and make us ill. We need clean air, but unfortunately, air pollution is globally present, especially in cities. ...
1. a mixture of gases (especially oxygen) required for breathing; the stuff that the wind consists of; "airpollution" "a smell of chemicals in theair" "open a window and let in someair" "I need some freshair" 2. travel via aircraft; ...