袁隆平的杂交水稻中，三系法为什么一定要有保持系？明明不育系和恢复系结合在一起就是杂交水稻了？知乎 Sketch Coloring Page

袁隆平的杂交水稻中，三系法为什么一定要有保持系？明明不育系和恢复系结合在一起就是杂交水稻了？知乎 Template

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