The registration address of the beijing air source trade and limited liability company is located at no. A2 of zhuo quan village, located in the city of beijing, under the registration authority of the beijing chamber of commerce and industry administration and represented by a legal person, and includes the sale of hardware, construction materials, lubricating oil, steel, decorating materials, auto accessories, electrical equipment, mechanical equipment, chemical products (without chemical hazards). (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