单项选择题
A.16 B.12 C.10 D.6
A.255.255.255.224 B.255.255.255.192 C.255.255.255.254 D.255.285.255.240
A.24B.32C.48D.128
A.127.0.0.1 B.255.0.0.0 C.255.255.0.0 D.255.255.255.0
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