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No.168Mentougou District Popularity Ranking BeijingNo.30 Coal MiningNo.51 Chemistry CompositingNo.52 CoalNo.52 Chemicals MaterialsNo.53 MineralsNo.54 Zi Ran Zi YuanNo.67 MiningNo.75 Ye Jin Kuang ChanNo.81 Chemicals Engineering Geology Metal Materials Mei Tan Kai Cai国家免检产品理事单位