当火灾报警控制器检测到外接受控消防设备的()信号时,反馈灯点亮,反馈信号消失或控制器进行复位操作后,此灯熄灭。
A、反馈
B、启动
C、火警
D、故障
参考答案:A
读句子,选出正确的答语。
1. Hello. My name is Li Nan.[ ]
A. Hello. I live in Beijing.
B. Hello. My name is Lu Zheng.
2. Hello. Nice to meet you.[ ]
A. How are you?
B. Hello. Nice to meet you, too.
3. May I have one marker, please?[ ]
A. Here you are.
B. There it is.
4. Good-bye, see you later![ ]
B. Good-bye.
在特别潮湿等危险环境中,使用手持照明灯应采用()安全电压。
A、36V
B、24V
C、12V