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【单选题】
因特网是一个庞大的计算机网络，每一台入网的计算机一般都分配有一个IP地址。下面关于IP地址的叙述中，正确的是______。 ①72.259.5.0可以作为一个IP地址 ②每一台上网计算机的IP地址都是惟一的 ③一台机器的IP地址可以用它的主机名代替 ④IP地址由类型号、网络号、主机号3个部分组成A.
①②④正确
B.
②③④正确
C.
只有②④正确
D.
都正确
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