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建国以来,我国排灌动力机械发展很快,取得了显著成绩。据统计,我国农用排灌动力机械逐年增长,1970年到1980年平均增长速度
Since the founding of the People’s Republic, China’s irrigation and drainage machinery developed rapidly and achieved remarkable results. According to statistics, China’s agricultural irrigation and drainage mechanics increased year by year, the average growth rate from 1970 to 1980