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【单选题】
下列关于同步网的描述正确的是( )。A.
是通信网正常运行的基础。
B.
同步网没有自己的管理监控网，它属于信令网的一部分。
C.
同步网是由单独的时钟设备组成的实体网。
D.
以上都不对。
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