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丹东市农业科研所于1972年(?)国外引入的玉米,选优良单株,(?)5代自交选育,于1974年育成的(?)色中间型自交系。幼苗叶鞘绿色,叶浓绿色,
The maize introduced by Dandong Agricultural Research Institute in 1972 (?) Was selected for its selfing and breeding in 5 generations on (?), Which was bred in 1974. Seedling sheath green, dark green leaves,