单选题
1分
_____ the alarm or trouble condition normally silences the own sounder of the control panel of the f...
_____ the alarm or trouble condition normally silences the own sounder of the control panel of the fire monitoring system.
参考答案: C
参考解析: 确认报警或故障条件下正常的,火灾监控系统控制面板是无声音的。