1. China's annual production of iron and steel increased to more than 50 million tons in 1988 from 1 million tons in 1949. Picture shows the heating process at a steel rolling mill of the Beijing...
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1. China's annual production of iron and steel increased to more than 50 million tons in 1988 from 1 million tons in 1949. Picture shows the heating process at a steel rolling mill of the Beijing...