【判断题】中国人民解放军由陆、海、空和海军陆战队四个军种组成。
【简答题】RS-232、RS-422与()都是串行数据接口标准,最初都是由电子工业协会(EIA)制订并发布的,标准只对接口的电气特性做出规定,而不涉及接插件、电缆或协议,在此基础上用户可以建立自己的高层通信协议。
【单选题】One day I asked the class to write about an important person in their lives, an assignment designed to hone their use of details.
【单选题】RS-232、RS-422 与()都是串行数据接口标准,最初都是由电子工业协会(EIA) 制订并发布的,标准只对接口的电气特性做出规定,而不涉及接插件、电缆或协议,在此 基础上用户可以建立自己的高层通信协议。
【判断题】SAP三层体系结构中中间层为应用程序层。
【单选题】RS-232、RS-422与RS-485都是()。
【简答题】Every mobile phone has a ringtone(铃声). It tells you that someone is calling you. Now, there _ a ringtone called “mosquito tone(蚊子铃声)”. Mosquito tone has a special . Only children and agers can he...