Which
of the following radioisotopes can not be used in PET scans?()
A: Carbon-13
B: Nitrogen-13
C: Oxygen-15
D: Fluorine-18
of the following radioisotopes can not be used in PET scans?()
A: Carbon-13
B: Nitrogen-13
C: Oxygen-15
D: Fluorine-18
举一反三
- Carbon 14 can only determine what kind of elements of cultural relics to determine the age.( ) A: copper B: nitrogen C: oxygen D: carbon
- Which is the most abundant atom (% body weight) in the human body? ( ) A: Hydrogen B: Oxygen C: Carbon D: Nitrogen
- ( ) 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