China Huanqiu Contracting & Engineering Corporation is a construction subsidiary of China National Petroleum Corporation specializing in the construction of refineries and chemical fertilizer plants connected to refineries, and mining plants. [1] [2] [3]
China Huanqiu Contracting & Engineering Corporation is a construction subsidiary of China National Petroleum Corporation specializing in the construction of refineries and chemical fertilizer plants connected to refineries, and mining plants. [1] [2] [3]