硅谷商站 --百度CEO李彦宏著作，是个描写IT界的商战-Silicon Valley Business Station- Baidu CEO Robin Li works, is a descr iption of the commercial IT sector battle

讲解群论的书记，由中科大的朱界杰老师讲解，很详细，很易懂，希望有需要的童靴自行拿去-Secretary of group theory to explain, by the USTC sector Jie Zhu teacher to explain, very detailed, very easy to understand, I hope there is a need to take their own children' s boots