Question: Xinjiang University is a national key university, and The University of California, San Diego is what?
Context: Zhongnan University of Economics and Law (); abbreviation ZUEL; colloquially known by the Chinese as zhōng nán cái dà ) is a national key university located in Wuhan, China.  It is one of the top 10 specialist finance, economic and juristic universities under direct administration of the Ministry of Education of the People's Republic of China.  It is designated as one of the 211 Project institutions and listed in the 985 Innovative Platforms for Key Disciplines Project by the Ministry of Education of the People's Republic of China. Northwestern Polytechnical University (also known as NPU or NWPU; ; Russian: Северо-западный политехнический университет ) is a National Key University, directed by the Ministry of Industry and Information Technology of the People's Republic of China, located in Xi'an, Shaanxi, China.  The university specializes in education and research in the fields of aeronautical, astronautical and marine engineering.   And, NPU's engineering ranked the 10th among China's engineering universities.  As of 2012, NPU has 13,736 graduate students (3,063 full-time doctorate candidates, 7,087 master candidates, 3,586 professional degree candidates) and 14,395 undergraduate students.  The university is a member of Project 985 and Project 211. Shihezi University is a university in Shihezi, Xinjiang, founded in April 1996 under the integration of institutional colleges by the Ministry of Education and the Xinjiang Production and Construction Corps.  It is a national key university. Southwest Agricultural University (西南农业大学) is a public and national key university located in Chongqing, China.  Founded in 1950, it was merged with Southwest Normal University in 2005 to form a new institution, Southwest University. National University of Defense Technology (NUDT, ) or People's Liberation Army National University of Defense Science and Technology in full () is a top military academy, as well as a research type national key university located in Changsha, Hunan Province, China.  It is under the direct leadership of China's Central Military Commission, and dual management of Ministry of National Defense of the People's Republic of China and Ministry of Education.  It is designated for Project 211 and Project 985, the two national plans for facilitating the development of Chinese higher education.  Its authority level equals the Deputy Military Region (see Military regions of the People's Liberation Army). The University of California, San Diego (officially known as the University of California San Diego with no comma or UC San Diego—no longer UCSD because the acronym is similar to that of other San Diego higher education institutions) is a public research university located in the La Jolla neighborhood of San Diego, California, in the United States.  The university occupies 2141 acre near the coast of the Pacific Ocean with the main campus resting on approximately 1152 acre .  Established in 1960 near the pre-existing Scripps Institution of Oceanography, UC San Diego is the seventh oldest of the 10 University of California campuses and offers over 200 undergraduate and graduate degree programs, enrolling about 22,700 undergraduate and 6,300 graduate students. The Huazhong University of Science and Technology (HUST; ) is a public, coeducational research university located in Wuhan, Hubei province, China.  As a national key university, HUST is directly affiliated to the Ministry of Education of China.  HUST manages Wuhan National Laboratories for Opto-electronics (WNLO) at Wuchang, which is one of the five national laboratories in China. China University of Mining and Technology (CUMT; ), colloquially 矿大, is a national key university under the direct supervision of the Ministry of Education of China, and a Project 211 and Project 985 platform (in terms of mining) university of China.  The university is ranked as the best mining university in China and has a worldwide reputation in coal mining technology and research.  It has two parts: the main campus located in Xuzhou, Jiangsu Province which is called China University of Mining and Technology (CUMT), and a second campus located in Beijing (China University of Mining and Technology, Beijing, CUMTB).  The latter used to be the Graduate School of CUMT.  CUMT is a leading multi-disciplinary polytechnic university with mining features. Xinjiang University (XJU) (, ) is one of the major universities in the Xinjiang Uyghur Autonomous Region, People’s Republic of China, and is a national key university.  Established in 1924 in Urumqi, Xinjiang University is a comprehensive university with the highest academic level in Xinjiang, under Project 211. Northwest A&F University (NWAFU, A&F referring to Agriculture and Forestry; simplified Chinese: 西北农林科技大学; pinyin: Xīběi Nónglín Kējì Dàxué; traditional Chinese: 西北農林科技大學), is a national key university located in Yangling Agricultural Hi-tech Industries Demonstration Zone, Shaanxi Province, P.R.China.  The university has an old and abandoned name called Northwest Sci-tech University of Agriculture and Forestry, NWSUAF for short, which is still kept in the domain name of the university's official website.
Answer: a public research university