Corrugated galvanized iron or steel, colloquial corrugated iron (almost universal), creeping tin (taken from British military slang), barrel (Caribbean English), corrugated sheet metal (North American) or tin (Australian), sometimes abbreviated CGI is a type of construction The material, consisting

Main logic:(1) On the supply side: In April 2021, the domestic output was 3.25 million tons, a year-on-year increase of 9.9%. In the second quarter, the resumption of production and new investment were promoted, and the domestic production was moving towards an annual output of 40 million tons. Conc