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使用交流收音机或扩音机收听广播节目时,往往在收到的强力电台信号的声音里伴随有很强的交流声,这严重影响收听效果。这种交流声,在调准电台时,它与电台信号
When listening to radio programs using an AC radio or a megaphone, there is often a strong hum associated with the sound of the powerful radio signal received, which seriously affects the listening performance. This humming sound signals the radio when it is timed to the radio