现在最常用的电子设备是手机或手机。随着通信技术的进步，对手机的需求急剧增加。手机通常在 0.9 至 3GHz 的频率范围内发送和接收信号。本文提供了一个简单的电路，通过检测这些信号来检测激活的手机是否存在。

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COUNTIES. SOMETHING NEW IS COMING TO KENNYWOOD THIS SPRING. WE WERE THE FIRST TO TELL YOU ABOUT KENNYWOOD’S DECISION TO CLOSE DOWN THOMASTOWN. NOW IT’S BEING REPLACED WITH KENNYWOOD JUNCTION ...

Today will see patchy cloud and bright spells. It will remain dry throughout much if the day, but light spells of rain will move in towards the evening. A chilly day. Tonight Tonight will see ...