如图是鸟卵的结构图请据图作答.1整个鸟卵从外围到中心共有 层膜.2图中3所示的结构的作用是 .3已经受精的卵�育成雏鸟的结构 Template




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tomski如图是鸟卵的结构图请据图作答.1整个鸟卵从外围到中心共有 层膜.2图中3所示的结构的作用是 .3已经受精的卵�育成雏鸟的结构 coloring