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[单选题]
《视频安防监控数字录像设备》(GB20815-2006),视频安防监控数字录像设备应具有故障报警功能,故障提示声压不得小于60dBA,持续时间不得小于()
A.2min
B.3min
C.5min
D.7min
![](https://lstatic.shangxueba.com/sxbzda/h5/images/tips_org.png)
A.2min
B.3min
C.5min
D.7min
第9题
A.A.GB/T28181
B.B.onvif
C.C.数字录像设备厂家SDK
D.D.GA/T669.5
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