http://www.khanacademy.org/ 特点：免费，深入浅出。 适合人群：从婴幼儿到大学生。 评价：Wanderful A free world-class education for anyone anywhere. The Khan Academy is an organization on a mission. We're a not-for-profit with the goal of changing education for the better by providing a ...
个性化系统的发展瓶颈浅析
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