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为了改良广选3号的米质,我们于1974年早造用同位素钴~(60)γ线2.9万伦琴照射广选3号干种子,到1976年秋初步育成广辐23
In order to improve the quality of Guangxuan No.3, we made a total of 29,000 Roentgen irradiated with isotope cobalt (60) γ ray to make No. 3 dry seeds as early as 1974,