1. frequency hopping radio set 
   跳频电台
2. frequency allocation to radio astronomy 
   射电天文频率分配
3. microwave and radio frequency spectroscopy 
   微波和射频波谱学
4. health effects of radio-frequency radiation 
   射频辐射对健康的影响
5. He tuned his radio to the police frequency. 
   他把无线电调到警方的频率。

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