结构化布线系统分为六个子系统，其中干线子系统的作用是（29） 。
- A.连接各个建筑物中的通信系统
- B.连接干线子系统和用户工作区
- C.实现中央主配线架与各种不同设备之间的连接
- D.实现各楼层设备间子系统之间的互连
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