单项选择题
A.16 B.32 C.64 D.128
A.130.57.16.254和130.57.32.254属于同一子网 B.130.57.16.254和130.57.17.01属于同一子网 C.130.57.16.254和130.57.33.01属于同一子网 D.130.57.17.254和130.57.32.254属于同一子网
A.255.255.255.0 B.255.255.254.0 C.255.255.252.0 D.255.255.240.0