题目内容
The degree of unsaturation of benzene is ( ) .
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The mass spectrometer does not include ( ) .
Among the following methods, which can determine the molecular mass?
For compounds composed of C, H, O, and N, the mass numbers of the molecular ion peaks of the mass spectrum are even numbers.
The peak with the largest mass-to-charge ratio in the mass spectrum must be the molecular ion peak.
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