The water (or snow) can become acidified when a pollutant combines with______ in the air.
droplets of water
举一反三
- What does the professor mean when he says this A: Little is known about defining a substance as an air pollutant. B: The substance isn’t an air pollutant when there is a very little in the air. C: The substance can’t be judged to be an air pollutant only from its actual concentration level. D: The actual concentration level means little to peopl
- Air pollution is becoming worse. As is known to all, air to us is ________ water to fish. No one can imagine how human being can live without air.
- 16. Retained soil can become saturated ___ water and then exert tremendous pressure.
- You can put knives in your hand bag when you travel by air.
- This wonderful plane can carry seven passengers. The most surprising thing about it, however, is that it can land anywhere: on snow, water, or even on a ploughed field.
内容
- 0
Animals can become unusually _____ when they are upset by a suddenenvironment change.
- 1
中国大学MOOC: Some people become （4） in winter, when the days are dark and most people spend less time in the open air.
- 2
There isn't water or air on the moon, and ____ man can't live on it. A: a B: the C: one D: /
- 3
Animals can become unusually ________ when they are upset by a sudden environmental change.
- 4
When making a landing over darkened or featureless terrain such as water or snow, a pilot should be aware of the possibility of illusion the approach may appear to be too（ ）