详细分析了交流接触器在不同使用条件下的闭合与分断时触点两端电压与回路电流情况，并研究了AC1～AC4工作制下的控制时序。
The conditions of voltage between contactors and current in main circuit under different using types are analyzed in detail, then designed the control sequences with working mode AC1-AC4.
串级控制系统中，控制回路是通过实时网络闭合的，称为网络化串级控制系统。
Cascade control systems wherein the control loops are closed through a realtime network are called networked cascade control systems.
推导并建立了陀螺系统和伺服执行机构的实物仿真模型，使之与角跟踪电路构成闭合控制回路。
Practical simulating models are deduced and built for the gyro system and the performing setting of the servo system to consist a close-control loop with angle-tracing circuit.
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