题目内容：
Electron affinity is the ability of molecule to attract electron.
A.正确
B.错误
参考答案：
选择题：Electron affinity is the ability of molecule to attract electron.
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According to Franck-Condon principle, and if the environmental influence to the two states is small, the absorption and the emission spectra will be mirror symmetry
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In spectra of optical absorption or emission, the rotational energy some time is observable as fine structure
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