The "12 zip" likely refers to a compressed archive containing all 12 problem sets (A through L) or winning source code solutions from that year's competition. Where to Find the Files
2021年全国大学生电子设计竞赛——信号失真度测量装置（A题）
: The nuedc-training.com.cn website usually hosts the official PDF problem sets and standard reports.
You can download the 2021 competition materials and technical write-ups from several technical repositories and official archives:
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