下图是胎儿与母体物质交换途径的示意图根据此图填写有关内容 1 胎儿与母体通过 进行物质交换 2 氧和养料丰富的血液是 3 Template




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tomski下图是胎儿与母体物质交换途径的示意图根据此图填写有关内容 1 胎儿与母体通过 coloring