单项选择题
A.Q1 B.Q2 C.Q1或Q2 D.不可到达
A.119.12.73.214 B.192.32.146.23 C.172.34.221.18 D.10.215.34.124
A.0.0.0.0 B.127.0.0.1 C.10.0.0.1 D.192.166.0.255/24