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【单选题】
下列关于IP地址和域名的关系,说法错误的是(  )
A.
一台主机通常只有一个 IP地址
B.
一台主机通常可以有多个域名
C.
主机移到另一网络 IP地址需改变
D.
主机移到另一网络时域名必须改变
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