下列关于声音的说法正确的是 A.声音在真空中传播的速度为340msb.声音只能在透明介质中传播c.牙�医生用超声波清洗牙垢属于声音的 Template




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tomski下列关于声音的说法正确的是 a.声音在真空中传播的速度为340msb.声音只能在透明介质中传播c.牙�医生用超声波清洗牙垢属于声音的 coloring