加密频道 encoded channel
精密频率计 precision frequency meter
更紧密频率覆用方式 Aggressive Frequency Re-use Pattern AFR
秘密频道 secret channel
精密频率控制 precision frequency control
音频高密度唱片系统 audio high density
频率密度 frequency density
频谱密度 [光] spectral density ; power spectral density ; Acceleration Spectral Density
视频高密度系统 video high density system
视频高密光盘 video compact disk ; vcd
There's also a tendency for churning for commission.
还有一个问题是频密交易
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