30s倒计时30s倒计时30s倒计时30s倒计时30s倒计时30s倒计时30s倒计时30s倒计时
2021-11-09 18:34:13
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multisim12下开发的使用555 和 192的30s倒计时器，具有开始和复位功能，操作使用空格键，运行简单而稳定
2020-12-21 19:52:18
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