如图是胎儿脐带和胎盘示意图请回答下列问题.1胎儿生活在 内半透明的液体 中.2一般来说怀孕到第 �时胎儿就�育成熟了.成熟的 Template




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tomski如图是胎儿脐带和胎盘示意图请回答下列问题.1胎儿生活在 内半透明的液体 中.2一般来说怀孕到第 coloring