radio spectral index

例句：

1. 1.The radio spectrum index is used to measure the strength of the radio waves.
   无线电谱指数用于测量无线电波的强度。
2. 2.The radio spectrum index is an important factor in determining the quality of the radio signal.
   无线电谱指数是决定无线电信号质量的重要因素。
3. 3.The radio spectrum index is used to identify the type of radio waves being transmitted.
   无线电谱指数用于识别正在传输的无线电波类型。