关键词:∫dx∫(x²+y²)dy환상-금지된정사버전迅雷下载电影鼩鼱艋舺电影高清The film fragment shows a general view of the open-hearth shop, the device of a 900-ton open-hearth furnace, the essence of the redox processes occurring in the furnace is considered. The fragment is mounted on the basis of the film "Fundamentals of blast-furnace steelmaking" (Sverdlovsk Film Studio)