本系统消防广播部分为总线制，由广播切换模块实现背景音乐与紧急广播切换。

This system fire prevention broadcast part is the main line system, realizes the background music and the urgent broadcast by the broadcast cut module cuts.

youdao

本系统消防广播部分为总线制，由广播切换模块实现背景音乐与紧急广播切换。

This system fire prevention broadcast part is the main line system, realizes the background music and the urgent broadcast by the broadcast cut module cuts.

youdao