设计并制作一个水温自动控制系统，控制对象为 1 升净水，容器为搪瓷或塑料器皿。水温可以在一定范围内由人工设定，并能在环境温度降低时实现自动控制，以保持设定的温度基本不变-Design and produce a temperature control system, control subjects were 1 liter of clean water, container or plastic containers for the enamel. Water temperature within a certain range can be set by hand, and decreases in ambient temperature automatically controlled to maintain the set temperature is essentially the same