某大型企业，它的业务范围广泛，在全国各大区域——华北、华东、华南、东北、西北、西南等均设有区域公司，每个区域公司下设有子公司，总部设在北京。具体如下华北区域公司中心位于北京，下设有天津、青岛两个子公司华东区域公司中心位于上海，下设有杭州、南京两个子公司华 A large-scale enterprise has a wide range of businesses. It has regional companies in all major regions in the country - North China, East China, South China, Northeast China, Northwest China, and Southwest China. Each of the regional companies has subsidiaries under its headquarter in Beijing. As follows North China regional company center is located in Beijing, under the Tianjin, Qingdao, two subsidiaries East China regional company center is located in Shanghai, Hangzhou, Nanjing under the two subsidiaries Hua