radio alarm signal无线电求救信号;无线电紧急信号;无线电警报信号;无线电报警信号
radio urgency signal无线电紧急信号
radio television signal射频电视信号
radio shunting signal无线电调车信号
radio time signal station无线电授时台
radio frequency signal generations多制式射频信号源
target radio holographic signal目标全息信号
radio calling signal station无线寻呼台
radio cab signal无线机车信号;主体化;论文关键词
With the big radio networks, it's very complex to estimate the pass loss when radio signal spreads through various terrains.
在移动通信网络中，无线信号在复杂市区等不同地况的传播变的十分复杂。
参考来源 - 无线信号在市区的传播分析、预测及评估