下列的实验和实例能说明声音的产生或传播条件的一组是 �在鼓面上放些碎纸�敲鼓时可观察到纸�在不停地跳动�放在真空罩里的手机有来电时 Template




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tomski下列的实验和实例能说明声音的产生或传播条件的一组是 �在鼓面上放些碎纸�敲鼓时可观察到纸�在不停地跳动�放在真空罩里的手机有来电时 coloring