单项选择题
A.33AB:0:0:CD30::/60 B.33AB:0:0:CD3/60 C.33AB::CD30/60 D.33AB::CD3/60
A.196.34.128.0/21 B.196.34.128.0/22 C.196.34.130.0/22 D.196.34.132.0/23
A.由终端到信息插座之间的连线系统 B.楼层接线间的配线架和线缆系统 C.各楼层设备之间的互连系统 D.连接各个建筑物的通信系统