Which of the following techniques are used for identification of unknown products? （ ）
A、Elemental analysis
B、nuclear magnetic resonance spectroscopy (NMR)
C、mass spectroscopy (MS)
D、infrared spectroscopy (IR)
发布时间：2025-06-16 12:41:31
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答案：Elemental analysis ■nuclear magnetic resonance spectroscopy (NMR) ■mass spectroscopy (MS) ■infrared spectroscopy (IR)
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