如图是鸽卵的结构图据图回答1写出标号所指结构名称� � 2� 为胚胎�育提供所需水分和养料� 为胚胎�育提供主要营养物质 Template




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tomski如图是鸽卵的结构图据图回答1写出标号所指结构名称� � 2� coloring