判断题

正丙苯可通过苯和丙酰氯反应，然后把羰基还原亚甲基得来。

答案：正确

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单项选择题

In the Zhou Dynasty, musical Instruments were classified into eight categories according to their materials: gold, stone, earth, leather, silk, wood, gourd, and bamboo, which is also known as the Eight-tone Classification Method recorded in ancient Chinese musical literature.( )

A．对
B．错

不定项选择

理想集成运放实现线性运算放大不一定非引入负反馈（）。

A．错误
B．正确