题目内容
双羊膜襄双绒毛膜单卵双胎( )。
2021-10-17
A.受精卵在受精后72小时内分裂
B.受精卵在受精后4〜8天内分裂
C.受精卵在受精后9〜12天内分裂
D.受精卵在受精后9〜13天内分裂
E.受精卵在受精后13天后分裂
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