用89C51制作八路抢答器：本文介绍一种用单片机控制的八路抢答器电路。本电路简单明了，所用成本低，可扩展为更多路数的抢答电路，亦可作为初学者朋友学习单片机的实验用电路。-89C51 production by eight-way devices Answer: This article describes the control of a single-chip eight-way with Answer circuit. The circuit is simple, using low-cos