题目

下列化合物分子中，在核磁共振1H谱图中能给出三种信号的是A．CH3CH2CH3        B．CH3CH2OH        C．CH3CHO       D．CH3OCH3  答案：B解析:略 () 15. —How far is your family from here?—It's about ten walk.   A. minute's   B. minute   C. minutes’   D. minutes