海南瑞泽(002596.SZ)：主营业务商品混凝土生产与销售全部在海南省内

Group 1 - The core business of the company is the production and sales of ready-mixed concrete, which is entirely based in Hainan Province [1] - The company is actively participating in the construction of projects related to the free trade port, infrastructure, and real estate [1]