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【单选题】
在物理层中,多路复用技术主要解决的是( )。A.
将数字信号变换成 适合在传输介质上传输的电平信号
B.
通过数字信号变换成模拟信号或模拟信号变换成数字信号，实现数字信号在模拟信道上传输或模拟信号在数字信道上传输
C.
实现两个通信结点之间传输码元的重复频率和起止时间的统一
D.
实现 多路信号在一条物理信道上进行传输
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