Coastal areas with frequent typhoons and severe salt spray corrosion, mountainous areas, islands, marshlands, and other remote areas with poor transportation; inland saline areas, areas with severe freeze-thaw cycles; areas with frequent lightning strikes; areas with frequent acid rain; military bases, radar stations, and base stations with special requirements for wave permeability; areas with significant temperature differences between day and night; and high-altitude areas for emergency rescue and disaster relief.




