DTMF 基本例句 双音多频 In order to achieve real-time remote monitoring in industrial wastewater discharge, an intelligent monitoring system is designed to transmit information by DTMF signal through telephone network. 为了实现远程实时监测工业污水的排放,研究设计出一种通过电话网络传输 DTMF信号进行远程控制的智能监测系统。 chemyq