单项选择题
A.A类B.B类C.C类D.D类
A.172.25.0.94B.172.25.0.95C.172.25.0.126D.172.25.0.127
A.255.255.255.0B.255.255.255.128C.255.255.255.192D.255.255.255.224E.255.255.255.240
A.隧道B.翻译/转换C.双栈D.以上答案都不对
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