如图观察人体胚胎�育示意图请回答1图中胎儿是由受精卵经过 分裂�育形成的.2胎儿在母体内�育时通过 与母体进行物质交换有人认为 Template




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tomski如图观察人体胚胎�育示意图请回答1图中胎儿是由受精卵经过 分裂�育形成的.2胎儿在母体内�育时通过 与母体进行物质交换有人认为 coloring