下列利用声音传递信息的是 A.用手指轻弹西瓜判断西瓜熟的程度b.利用超声波除去人体内的结石c.利用超声波加湿器湿润室内空气d.利用超声波来 Template




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tomski下列利用声音传递信息的是 a.用手指轻弹西瓜判断西瓜熟的程度b.利用超声波除去人体内的结石c.利用超声波加湿器湿润室内空气d.利用超声波来 coloring