下面哪些协议支持可变长度子网掩码和路由聚合?()。
A.RIP v1
B.RIP v2
C.OSPF
D.VTP
参考答案:B, C
-----How good the news is for you!
------ ______________.
A.You are friendly to tell me
B.I'm glad to see that
C.It's kind of you to say so
D.It's nice to hear from you
麻疹出疹一般在发热后的()。
A.1~2天
B.3~4天
C.5~6天
D.7~8天
E.9~10天