技能训练视频平台

20220516-褶皱-10190139

Added by 10190139 3 年 ago

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200605-等差数列前n项和2-22171921

Added by 姜彦菁 5 年 ago

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20220516-黄土高原水土流失的成因-10190425

Added by 10190425 3 年 ago

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因为返校前在酒店住满14天，用PPT画笔代替黑板，实验演示部分是上个礼拜在家里的时候拍的

200604-平方差公式2-22170608

Added by 22170608 5 年 ago

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