单项选择题
A.224.0.0.1 B.127.0.0.1 C.169.254.1.15 D.192.168.0.1
A.255.255.240.16 B.255.255.16.0 C.255.255.248.0 D.255.255.240.0
A.18.0.0.14 B.18.31.0.14 C.18.240.0.0 D.18.9.0.14