题目内容
In the infrared absorption spectrum, the C-C vibration absorption peak of aromatic hydrocarbon appears at（ ）
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Among the following compounds, the highest frequency of C-O stretching vibration is（ ）
When using infrared analysis, the solvent that should be selected is（ ）
The main adsorptions of aldehyde group are at 1750~1700 cm-1, 2820 cm-1, and 2720 cm-1.
The commonly used light source in infrared spectrophotometer is hollow cathode lamp.
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