消防应急广播的单次语音播放时间宜为( )。A.8s~20s B.10s~30s

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问题 消防应急广播的单次语音播放时间宜为( )。A.8s~20sB.10s~30sC.8s~30sD.10s~20s

选项 A.8s~20s
B.10s~30s
C.8s~30s
D.10s~20s

答案 A

解析 消防应急广播的单次语音播放时间宜为8s~20s。
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