首页建筑工程考试建造师一级建造师机电工程管理与实务
(单选题)

多年来,通信网主要采用铜线(缆)用户线向用户提供传送电话的业务,用户铜线(缆)网分布广泛且普及,为了进一步提高铜线传输速率,开发了( )技术,以解决高速率数字信号在铜缆用户线上的传输问题。

ANGN

B软交换

CDSL

DIP

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