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关于桑椹胚的叙述,下列哪一项是错误的

A、受精后72小时形成桑椹胚

B、由12~16个卵裂球构成

C、体积较受精卵大

D、有透明带包围

E、已进入子宫

时间：2021-07-17 23:16 关键词：护理学专升本组织胚胎学期末成绩低于60分期末考试

答案解析

E

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