Of the more common elements(元素) are hydrogen, oxygen, carbon, iron, copper, etc.
举一反三
- Which elements is not one of the three most common ones in a plant? A: Carbon B: Hydrogen C: Oxygen D: Sulfur
- Carbon 14 can only determine what kind of elements of cultural relics to determine the age.( ) A: copper B: nitrogen C: oxygen D: carbon
- The synonym of CO2 is .（ ）。 A: hydrogen B: carbon monoxide C: carbon dioxide D: oxygen
- ( ) is taken in by plants to make food. A: nitrogen B: hydrogen C: oxygen D: carbon dioxide
- The gas with maximum percentage in the atmosphere is ( ). A: nitrogen B: hydrogen C: oxygen D: carbon dioxide