单项选择题
A.115.17.198.0 B.115.17.206.0 C.115.17.217.0 D.115.17.224.0
A.1024 B.1023 C.1022 D.1000
A.192.178.32.0 B.128.168.32.0 C.172.15.32.0 D.192.168.32.0