求翻译：a. 当发生火灾时，接通消防事故广播，进行火灾疏散广播。广播系统设置火灾应急广播备用扩音机，其容量不应小于火灾时需同时广播的范围内火灾应急广播扬声器最大容量总和的1.5倍。是什么意思？

When a fire occurs, turn the fire accident broadcasting, conducted fire evacuation broadcast. Broadcasting System Settings the fire emergency broadcast spare amplifiers, its capacity of not less than the fire, to be broadcast at the same time within the fire emergency broadcast speaker of the sum of

A. When there is a fire, and broadcast on fire incidents, fire evacuation announcements. Broadcasting System set up fire emergency broadcast spare amplifiers, the capacity should not be less than fire is within the context of the broadcast simultaneously fire emergency broadcasting speaker and the m

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A. when a fire occurs, connected to broadcast fire accident, fire evacuation broadcast. Broadcasting system set fire-emergency broadcast an alternate machine, simulcasting when its capacity shall be not less than the fire fire emergency radio and speaker within the context of a maximum capacity of 1

a. When has the fire, the connection fire prevention accident broadcasts, carries on the fire to disperse the broadcast.The broadcast system establishment fire emergency broadcast spare megaphone, its capacity should not be smaller than when the fire must simultaneously broadcast in the scope the f