单项选择题
A.34.45.67.111/8是一个A类地址 B.112.67.222.37和112.67.222.80属于同一个IP子网 C.145.48.29.255是一个子网广播地址 D.123.244.8.0是一个子网网络地址
A.150.150.37.2 B.150.150.16.2 C.150.150.8.12 D.150.150.47.255
A.4 B.5 C.9 D.12