28. Which of the following statements about mass spectrometry is correct?
Ⅰ.The ions are separated based on their charge-to-mass ratio.
Ⅱ.Chemical ionization produces more fragmentation than electron ionization.
Ⅲ. Mass spectrometry can be used to accurately measure small differences in isotopic abundance.
(A) I and II only
(B) I and III only
(C) II and IiI only
(D) III only
(E) I only
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