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【单选题】
一个用户用PC机上的聊天软件与其使用手机的远程朋友之间通过互联网在进行语音通信,则关于这台PC机和手机以下描述中,正确的是A.
PC 机和手机均属于通信子网
B.
PC 机属于通信子网，手机属于资源子网
C.
PC 机和手机均属于资源子网
D.
PC 机属于资源子网，手机属于通信子网
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