关于声现象下列说法正确的是 A.只要物体振动就一定能听到声音 b.声音在真空中的传播速度为340ms c.声源的振幅越大音调越高 D Template




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tomski关于声现象下列说法正确的是 a.只要物体振动就一定能听到声音 b.声音在真空中的传播速度为340ms coloring