document.write("Engineering: Petroleum, chemical, petrochemical, pharmaceutical, textile, city construction, building materials, metallurgy, energy, transportation, agriculture, forestry, geology and mining, raw materials, refrigeration air conditioning, water supply and drainage, fluid transportation, heating, environmental protection, energy saving, water saving and other aspects of project contracting and complete sets of equipment services./n Design categories: petroleum, chemical industry, light industry, refrigeration air conditioning, water supply and drainage, fluid transportation, heating, environmental protection, energy conservation, water conservation, etc. design.");