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某化合物以水作溶剂,在UV光区214nm处有一弱吸收带,在红外光谱的官能团区有如下吸收峰:3540~3480cm-1和3420~3380cm-1双峰,1690 cm-1强吸收,则该化合物可能是
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某化合物在UV光区270nm处有一弱吸收带,在红外光谱的官能团区有如下吸收峰:2700~2900cm-1,1725 cm-1强吸收,则该化合物可能是
属于对称矩阵的不同特征值的特征向量一定正交.
同济 P129 EG12、13注：自己看书即可.
Colleges and universities have many things in _____1________. Both provide a greater ______2__________ of the world and its past. Both provide education in the arts and sciences. And both can help prepare young people to ____3________.
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