20.下列有关生物学知识叙述正确的是 A.在豌豆开花以前用纸袋套住花蕊不让它接受外来花粉最终也能产生种子原因是豌豆不需要经传粉受精 Template




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tomski20.下列有关生物学知识叙述正确的是 a.在豌豆开花以前用纸袋套住花蕊不让它接受外来花粉最终也能产生种子原因是豌豆不需要经传粉受精 coloring