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某方波信号的周期T=5μs,则此方波的三次谐波频率为(  )
某方波信号的周期T=5μs,则此方波的三次谐波频率为()
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某方波信号的周期T=5μs,则此方波的三次谐波频率为()
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以下哪种码型是CCITT推荐的30/32路PCM基础,二次群,三次群设备的传输码型?()。
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