タイトルまたは説明

They are mainly used as the enclosure of the expressway, the isolated network of frontier, the protects network of greenbelt on the road, The shelter of mechanic and equipment, the enclosure of sports playground, the network of civil construction criticizes. They are also used as steel in the construction, the bridges, the highway. On the one hand, they are the first-class material of preventing and fighting the flood to protect and support sea wall