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https://www.math.pku.edu.cn/xyxw/121972.htm 只知道lb常微分考试题出挺难
之前选过一次高数，我都忘了难度了，最后成绩不上不下，感谢老师不杀之恩（
不懂内幕，听说是教务的锅
lb线代B也挺难的，教的挺好
