网络释义
1)fdm,频率划分2)frequency multiplex,频率划分3)table of frequency allocations,频率划分表4)frequency sharing scheme,频率划分制5)frequency division of channel,信道的频率划分6)frequency division,分频，频率划分7)frequency division modulation,频率划分调制8)frequency-sharing circuit,频率划分电路9)classification of rad o frequencies,射频频率划分（电信）10)fdm,频率划分多路传输
