Automatic regulation must be added owing to the unstable characteristics of the open loop secondary system.
由于二次调节的开环不稳定特性，必须为其设置自动调节系统。
The control mode of mixed loop of heat-supply secondary circuit and the design key points of the control system are introduced.
介绍了供热二级管网混合回路的控制方式及控制系统的设计要点。
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