继电器广泛用于生产控制的电力系统中，其作用是利用它的常闭 和常开触点进行电路切换。由于继电器是利用改变金属触点位置，使 动触点和定触点闭合或分开，所以具有接触电阻小，流过电流大和耐 压高等优点，特别适用于大电流高电压的使用场合。小型继电器也常 用作精密测量电路的转换开关。-Relays are widely used in electricity production control system, its role is to make use

My program is for cashiering, using simple java code and easy for beginners to understand. You can control flow by selecting options and so on, no GUI.

主要用在机械动力学软件Adams软件进行仿真流程控制的程序-Adams software simulation flow control procedures

采用微分先行PID控制实现对液位的控制采用增量式PI控制实现流量的快速跟踪且波动范围较采用经验方法分别对上述两个PID控制器参数进行整定。-Of liquid level control is realized by using derivative ahead PID control flow is realized by using incremental PI control of the fast track and the fluctuation range respectively