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* 质量渗透效应 https://www.zhihu.com/question/437181397/answer/1663670296
* 社会主义 https://www.zhihu.com/question/302242038/answer/672306039
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* 书籍PPT资源
* http://www.cmpedu.com/ziyuans/index.htm 机工
* http://51eds.com/tdjy/shiro/index.action 铁道出版社
* https://www.ryjiaoyu.com/resource 人邮
* http://www.tupwk.com.cn/downpage/ 清华大学出版社