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<正> (一)频率 FREQ frequency 频率 kHz kilo hertz 千赫 MHz mega heaz 兆赫 Frequency of signal 信号频率 Radio 射频,无线电 RF radio frequency 射频,高频 SHF super high frequency 超高频(3~30GHz) UHF ultra high frequency 特高频(300~3000MHz) VHF very high frequency 甚高频(30~300MHz) IF i