众所周知,板材和管材作为某些产品的原材料,在国民经济的许多行业里占有很重要的地位。多年来,国内板、管材的生产、供应也已有了长足的进展。然而,随着国家经济建设的加速,特别是国家为了实现新世纪的建设目标,迈开了西部大开发的步伐,也提出了国内近期要加强基础设施建设的要 It is well known that plates and tubes, as raw materials for certain products, play an important role in many sectors of the national economy. Over the years, the domestic plate, pipe production, supply has also made considerable progress. However, with the acceleration of the country’s economic construction, especially in order to realize the goal of construction in the new century, the country has taken steps toward the development of the western region and also proposed that the country should strengthen infrastructure construction in the near future