Does China's construction and installation belong to state-owned enterprises or central enterprises?

Zhong Jian Installation is a state-owned enterprise. China Construction Third Bureau Digital Engineering Co., Ltd. (China Construction Third Bureau Installation Engineering Co., Ltd.) is a large-scale construction installation and digital service enterprise directly under China Construction Third Bureau, a national high-tech enterprise, and an important professional platform for China Construction Third Bureau to promote industrial digitalization and digital industrialization. The business scope of the company includes: installation, maintenance and testing of power facilities (operating with a license); Installation, renovation and maintenance of pressure pipes, lifting machinery and boilers; Pressure vessel manufacturing, construction machinery leasing; Sales of building materials; Installation, modification and maintenance of special equipment (operated by certificate). As a Class A subsidiary of the Group, China Construction and Installation No.1 Company is headquartered in Jinan, Shandong Province, a beautiful "Spring City", with five branches in Jinan, Qingdao, Tianjin, Zhongyuan and Petrochemical. Its business scope covers the whole Shandong, Beijing-Tianjin-Hebei Capital Economic Circle, Yellow River Golden Triangle and its surrounding areas. Actively carry out "transformation and upgrading", and successively build EPC general contracting projects such as Zhongyuan Big Data Industrial Park, renovation of old residential areas in Liaocheng, chemical projects such as Rizhao Port Oil Terminal, electromechanical projects such as Qingdao Haitian Center, and new infrastructure projects such as China Mobile Luoyang Computer Room. The types of projects are comprehensive and diverse, and a hundred flowers blossom.