钢材、水泥、木材统称为“三材”,是社会主义建设的重要物资。钢材、水泥的产量解放三十年来增长的速度是比较快的,在国民经济调整期间,我国1980年钢材产量为2716万吨,较1970年增长8.8％;水泥产量为7986万吨,较1979年增长8.1％;钢材、水泥工业的建设,只要有投资保证,与林木生产比较起来,它们在短期内是能够缓和供需矛盾的。 Steel, cement and timber are collectively referred to as “three materials,” and they are an important material for socialist construction. During the period of national economic readjustment, China’s steel output in 1980 was 27.16 million tons, an increase of 8.8% over 1970; the output of cement was 79.86 million tons, a year-on-year increase from 1979 An increase of 8.1%. As for the construction of steel and cement industries, as long as there is investment guarantee, they will be able to ease the contradiction between supply and demand in the short term as compared with forest production.