下图是鸡卵的结构请据图回答问题.1图中的能为胚胎�育提供营养的结构是 和 .2鸡卵没有图中 结构就不能�育为雏鸡 Template




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tomski下图是鸡卵的结构请据图回答问题.1图中的能为胚胎�育提供营养的结构是 和 .2鸡卵没有图中 coloring