如图1为鸟卵结构示意图图2为鸟胚胎�育示意图请据图回答1图1中3和图2中3的结构都是卵黄.它的主要作用是为胚胎�育提供营养 Template




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tomski如图1为鸟卵结构示意图图2为鸟胚胎�育示意图请据图回答1图1中3和图2中3的结构都是卵黄.它的主要作用是为胚胎�育提供营养 coloring