The registration agency is the market supervision authority of the beijing city house, located at 86-a4628 wanhing road in the beijing city house, and is represented by the legal person li jinjin, who works for the installation of electrical equipment, electrical equipment, maintenance of electrical equipment, sale of fire-fighting equipment, water treatment equipment, mechanical equipment, mechanical and electrical equipment, heating equipment, electronics, hardware delivery (without electric bicycles), construction materials, decoration materials; general construction contract; professional contracting; and labour subcontracting. (an enterprise shall, in accordance with the law, freely choose to operate its own projects and carry out its activities; an approved project shall, in accordance with the law, operate its activities in accordance with the approved content, subject to the approval of the relevant sector; and it shall not engage in activities in which the industrial policy of the municipality prohibits or restricts the operation of projects of its kind