Zhōnggòng Zhōngyāng Bàngōngtīng fābù le xiāngguān tōngzhī.
The General Office of the CPC Central Committee issued the relevant notice.
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Short for 中国共产党中央委员会 'Central Committee of the Communist Party of China.' In news copy you constantly see paired phrases like 中共中央、国务院 (Central Committee + State Council) which signal joint Party-and-government documents — the highest tier of policy authority in PRC.