2017届高考英语考前冲刺：常用短语句型归纳_高考复习指南

　　）

　　A．振动加强的点是b、c

　　B．振动加强的点是a、d

　　C．振动加强的点是a、b、c、d

　　D．经过一半周期，振动加强的点是b、c

　　解析：实线与实线的交点以及虚线与虚线的交点是振动加强点，实线与虚线的交点是振动减弱点，所以振动加强的点是a、db、c

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