根据下边鸟卵的结构示意图回答1�是 是由受精卵细胞分裂而形成的.2�是 内贮存供胚胎�育的 .3�是 提供胚胎�育所需的 Template




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tomski根据下边鸟卵的结构示意图回答1�是 是由受精卵细胞分裂而形成的.2�是 内贮存供胚胎�育的 coloring