Which about Time Division Multiplexing is true ? ( )

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问题 Which about Time Division Multiplexing is true ? (    )

选项 A、TDM can only transmit digital signals
B、TDM divides the time that is used to transmit signals by channel into several time fractions and each user get a time fraction
C、Synchronous TDM may allocate channel time fraction dynamically
D、TDM can only transmit analog signals

答案B

解析
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