题目内容
关于妊娠时限的概念，正确的是
2021-11-02
A.妊娠21周为中期妊娠
B.妊娠28周至37周分娩为早产
C.妊娠38周至42周分娩为足月产
D.妊娠41周之后分挽为过期产
E.在分挽过程中胎儿死亡为死产
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