Double-T beams, prestressed double-T beams, precast concrete double-T beams, cement products, concrete structural components, other cement-like products, manufacturing, processing, sales, and installation of lightweight building materials; general cargo handling and transportation services; sales of building materials; mold production and sales; human resources services; outsourcing services for enterprise production processes, production sections, and factory operational management through service outsourcing; general road cargo transportation; labor分包 in the construction industry.