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下面说法正确吗？串口通信的波特率为4800Bd,表示串口每秒传送4800位二进制数
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火灾发生初期，将现场探测到的温度或烟雾浓度等信号发给，对信号进行简单判断、处理，确定火情后，发出报警信号，并将信息传给，记录火灾信息，显示报警部位，协调联动控制，完成一系列指令，如：开启（哪一层）的疏散警铃，打开通知人员尽快疏散；打开排除烟雾；关闭相应的，防止火灾蔓延；开启紧急诱导照明；迫降电梯回，电梯停止运行，电梯投入紧急运行；当火场温度上升到一定值时，（灭火方式）开启。
社区保安与传统的群防群治组织最大区别在于保安开展的是( )。
中国保安服务业的诞生在( )。
Choose the best answers to complete the following passage.Next time you see a pigeon flying1 the sky, look at it carefully! Is it holding a can? Or a camera? Or wearing a backpack? If it’s a carrier pigeon, it just might be a working bird.You’ve probably2 of working dogs that help police officers, or horses that help farmers. Did you know that carrier pigeons can be3 to help people too? What kind of jobs do these birds4?Carrier pigeons can be trained to carry messages to people. The note is5into a small skinny can. The can is6to the pigeon’s leg. Then the pigeon flies off to7the note. Carrier pigeons are good messengers because they’re fast and can fly long distances. They also have a good8of direction. They can even reach places that people can’t. More than 800 years ago, Genghis Khan, an Asian9set up pigeon post offices across his lands! As recently as 2010, Cuba used pigeons to send election10to its mountain people.
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