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旨在传播马克思主义和共产主义的历史文献和参考资料

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Freesound: collaborative database of creative-commons licensed sound for musicians and sound lovers. Have you freed your sound today?

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最早的公益型数字图书馆，搜索菜单里可按语言筛选图书资源

微软原Office等办公软件套装