一、从钢铁工业产业集中度的国际比较看发展大集团的必要性我国钢铁工业自改革开放以来有了突飞猛进的发展，钢产量由１９７８年的３１７８万吨增长到１９９７年的１０７５７万吨，增长近２４倍。然而，生产却呈现日益分散的趋势。以年产５０万吨钢的企业为例，一方面所... I. From the International Comparison of Industrial Concentration in the Iron and Steel Industry, the Necessity of Developing Large Groups Since the reform and opening up, China’s steel industry has made rapid development. The output of steel increased from 31.78 million tons in 1978 to 107.57 million tons in 1997 Nearly 2  4 times. However, production is showing a trend of divergence. Take the annual output of 500,000 tons of steel enterprises, for example, on the one hand ...