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- 逻辑开关K0~K7代表竞赛抢答按钮0~7号,当某个逻辑电平开关置“1”时,相当某组抢答按钮按下。在七段数码管上将其组号(0~7)显示出来。-Logic Switch K0 ~ K7 on behalf of race to answer in the button 0 ~ 7, when a logic level switch set to " 1" when the button is pressed to answer in quite a group. In the s