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广播站播出系统或者重要会议扩音系统应具备如图1所示的主、备线放和主、备功放之间的切换功能。在这里要求:主、备线
Broadcasting station broadcast system or an important meeting of the PA system should have the main and backup line as shown in Figure 1 and the main and backup power amplifier switching function. Requirements here: Lord, prepare the line