Carbon 14 can only determine what kind of elements of cultural relics to determine the age.( )
A: copper
B: nitrogen
C: oxygen
D: carbon
A: copper
B: nitrogen
C: oxygen
D: carbon
举一反三
- Of the more common elements(元素) are hydrogen, oxygen, carbon, iron, copper, etc.
- ( ) 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
- （ ）is the most abundant chemical element in plants and animals. A: Oxygen B: Carbon C: Hydrogen D: Nitrogen
- What caused the deposits A: The hydrochloric acid broke the carbon bonds in tile carbon dioxide, B: The magnesium oxide broke the carbon oxygen bonds in the carbon dioxide. C: The burning magnesium broke the carbon oxygen bonds in the carbon dioxide. D: The gas collection method broke the carbon-oxygen bonds in the carbon dioxid