微波全景频谱分析仪micro wave all-pictrue frequency spectrum analyzer
相对频率relative frequency
空间频率spatial frequency
射频干扰测试radio-frequency interference test【电子】
观察频数observed frequency
接收信道中心频率receive channel center frequency【通信】
【电学】转发器电路低频放大器low-frequency amplifier for repeater circuits
视停次数fixation frequency