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【单选题】
孤立甲基的弯曲振动一般为 1380 cm-1 ,基中的甲基分裂分为 1385 cm-1 和 1375 cm-1 ,叔丁基中的甲基为 1395 cm-1 和 1370 cm-1 ,造成的原因是A.
分子的对称性
B.
振动耦合
C.
共振
D.
诱导效应
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