问答题

Since all groups have their（）特征振动频率, information regarding molecular structure can be gained from the spectrum.

答案：正确答案：characteristic vibrational frequency

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Thes analysis etechniques for chemical composition could be classified as（）（光谱学）, which is study of the interaction between matters and radiated energy.

答案：正确答案：spectroscopy

单项选择题

In SEM, magnification is controlled by objective lens power.

A.正确
B.错误