电阻器和电容器一起组成计时器，晶体管作为开关。
The resistor and the capacitor together were the timer, and the transistor worked as the switch.
采用计时器电路按照规定的时间间隔控制在线和离线塔的开关，从而使空气干燥和干燥剂再生可连续进行。
The timer circuits in accordance with the prescribed time interval control online and offline tower, thus make the switch of dry air and desiccant can continuously regeneration.
便携式电子计时器装有已过时间指示器，间隔计时器和电子开关计时器。
Portable electric timer functions as elapsed-time indicator, interval timer and electrical apparatus on-off timer.
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