5、lcircuitandhost'sswitch,twotheabove-mentionedpartsmakeupthesubjectcircuit.Throughtimingcircuitanddeciphersecondsignalfunctionwhileoutputsandrealizescountingonthedisplayingthatpulseproducecircuit,formandexpandthecircuit.Keywords:Vieforansweringthecircuit Timingcircuit Warningcircuit Time