Which middle school did President Gu of Tsinghua University graduate from?

Gu (1945-), a native of Dehui, Jilin Province, graduated from Baotou No.9 Middle School, an academician of China Academy of Sciences, a physicist and a material scientist.

1965 entered Tsinghua University to study, 1970 graduated from university and stayed in school to work. From March 1973 to July 1975, and from June 1978 to June 1979, I studied in Tsinghua University Solid State Physics Seminar. 1979 went to study in Aarhus University, Denmark, and 1982 received his doctorate. He used to be a professor, vice president and head of the Department of Physics in Tsinghua University, a visiting scholar at the University of Notre Dame and the University of Tokyo in the United States, and a visiting professor at Tohoku University in Japan. 1999 was elected as an academician of China Academy of Sciences. In March 2000, he served as Dean of Tsinghua University Graduate School; In March of 20001year, he served as vice president of Tsinghua University and concurrently served as chairman of academic degree evaluation committee; In April 2003, he served as president of Tsinghua University. At present, he is a member of the State Council Academic Degrees Committee, convener of physics and astronomy appraisal group, member of National Science and Technology Award Committee, vice chairman of Chinese Physical Society, chairman of Chinese Stereology Society, chairman of China Micro-Nano Technology Society and vice chairman of China Environmental Protection Federation.