What gas does not pollute the air
A: Oxygen.
B: Hydrocarbons.
C: Carbon monoxide.
D: Nitrogen oxides.
A: Oxygen.
B: Hydrocarbons.
C: Carbon monoxide.
D: Nitrogen oxides.
举一反三
- The gas with maximum percentage in the atmosphere is ( ). A: nitrogen B: hydrogen C: oxygen D: carbon dioxide
- The main air pollutants include : particulate matter, Ground-level ozone, Nitrogen dioxide, sulfur dioxide, carbon monoxide and lead.
- The synonym of CO2 is .（ ）。 A: hydrogen B: carbon monoxide C: carbon dioxide D: oxygen
- The most significant constituents of coal are . A: hydrocarbons B: sulfur C: oxygen D: nitrogen
- Carbon 14 can only determine what kind of elements of cultural relics to determine the age.( ) A: copper B: nitrogen C: oxygen D: carbon