下图是鸟卵的结构图据图回答 1内贮存供胚胎�育用的营养物质是卵细胞的主要营养部分的结构是 2卵黄上的小白点叫 里面含——青 Template




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tomski下图是鸟卵的结构图据图回答 1内贮存供胚胎�育用的营养物质是卵细胞的主要营养部分的结构是 2卵黄上的小白点叫 coloring