For example, switching logic can be defined to have the return fan start after a programmed delay from the time that the supply fan was started.
比如一个切换逻辑可以用来定义一个风机的开起，当程序定时过后，风机起动。
In the water supply process, the turnover temperature of the PCM appeared two minutes later than the water temperature on the height, which indicates that the PCM has the features of time delay.
在放热过程中，蓄热材料温度变化拐点值比同高度的水温拐点值的出现慢2分钟，说明相变蓄热材料具有延时性。
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