求翻译：8路抢答器主要是基于 7 4系列集成芯片组成电路各个部分，成本较低 ，且基本能够使用于学校的一些活动中。采用七段共阴极LED数码管显示抢答序号和定时时间，由74LS48数字显示译码管显示数码管。该抢答器除具有基本的抢答功能外，还具有定时、计时和报警功能。 主持人通过时间预设开关预设供抢答的时间，系统将完成自动倒计时。若在规定的时间内有人抢答，则计时将自动停止；若在规定的时间内无人抢答，则系统中的蜂鸣器将发响，提示主持人本轮抢答无效，实现报警功能。是什么意思？

8-way Responder is the composition of the various parts of the circuit based on the 74 series chip, low cost, and basically be able to use some of the activities of the school. Using the seven-segment common cathode led digital tube display the answer in the serial number and timing, and display dig

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8 groups vie to answer first mainly are based on 7 4 series integrated chip composition electric circuit each part, the cost are low, also basic can use in school some moves.Uses seven section of common cathode LED nixietube to demonstrate vies to answer first the serial number and fixed time the ti

正在翻译，请等待...

正在翻译，请等待...