Gas and liquid separation equipment, design, manufacturing, and sales of mining and quarrying equipment; manufacturing and sales of hardware accessories; operation of export business of the company's own products and technologies, and import business of machinery and equipment, spare parts, raw materials, and technologies required by the company (except for goods and technologies subject to state规定的 company operation or prohibited from import and export); (Where applicable, in accordance with relevant laws and regulations, the company is permitted to operate freely.) General projects: ocean engineering design and module design and manufacturing services; manufacturing of ship equipment; sales of ocean engineering equipment; manufacturing of pumps and vacuum equipment; sales of pumps and vacuum equipment; manufacturing of waste treatment equipment for domestic waste; sales of waste treatment equipment for domestic waste; manufacturing of special equipment for refining oil and chemical production;