文件名称:qdq
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1、试验目的：了解按键的扫描原理
2、实现现象：同时按键抢答，先按的键有效，其他按键锁死 复位后重新开始抢答
3、硬件要求：按键 LED灯 -A test purpose: to understand the key scanning principle, to achieve the phenomenon: while key answer in, press the keys, other keys to lock reset to re-start after the answer in three hardware requirements: button LED lights
2、实现现象：同时按键抢答，先按的键有效，其他按键锁死 复位后重新开始抢答
3、硬件要求：按键 LED灯 -A test purpose: to understand the key scanning principle, to achieve the phenomenon: while key answer in, press the keys, other keys to lock reset to re-start after the answer in three hardware requirements: button LED lights
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抢答器.c
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