A.55.255.248.0
B.255.255.224.0
C.255.255.248.0
D.255.255.192.0
第4题
A.192.168.12.32192.168.12.127
B.192.168.0.0255.255.255.255
C.192.168.12.43255.255.255.128
D.192.169.12.0192.168.12.127
为了保护您的账号安全,请在“上学吧”公众号进行验证,点击“官网服务”-“账号验证”后输入验证码“”完成验证,验证成功后方可继续查看答案!