单项选择题

The two stretching vibrations of C=C bond in butadiene molecule are as follows: ① ② . Which one has infrared active? ()

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单项选择题
A．D B．B C．C D．A
A．D
B．B
C．C
D．A
问答题
If with the darkness of the fourth night you knew that the sun would never rise for you again, how would you spend those three precious intervening days?
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