智能抢答器，具有四路抢答输入，能够识别最先抢答的信号，显示该台号；对回答问题所用的时间进行计时、显示、超时报警；同时具有复位功能。倒计时启动功能。-Smart Responder, with four answer in input, to identify the first answer in the signal, indicating the station number on the answer to this question is the time to time, displ