以下哪个不是密集组播路由协议( )
A. DVMRP
B. MOSPF
C. PIM-DM
D. CBT
In the first sentence of Paragraph 2, "interpreting" probably refers to ______.
A. according to
B. explaining
C. carrying on
D. doing away
以下哪种P2P网络拓扑属于混合式结构( )
A. Chord
B. Skype
C. Pastry
D. Tapestry
以下哪种业务属于IPTV通信类服务( )
A. 视频点播
B. 即时通信
C. 时移电视
D. 直播电视