题目内容
The m/z of the molecular ion peak of a compound is 87. ( ) may be the formula of the compound.
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The degree of unsaturation of benzene is ( ) .
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.
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