1.如图是胎儿脐带和胎盘的示意图.据图分析并回答问题.1胎儿在母体的�子宫里�育胎儿所获得的营养需经过�胎盘和�脐带从母体获得.2 Template




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tomski1.如图是胎儿脐带和胎盘的示意图.据图分析并回答问题.1胎儿在母体的�子宫里�育胎儿所获得的营养需经过�胎盘和�脐带从母体获得.2 coloring