单项选择题
A.1~32 B.1~512 C.1~4094 D.0~4095
A.192.168.168.129-190 B.192.168.168.129-191 C.192.168.168.128-190 D.192.168.168.128-192
A.255.255.255.0 B.255.255.255.128 C.255.255.255.192 D.255.255.255.224
A.2046 B.2048 C.4094 D.4096
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