诊断出生缺陷或确定胎儿性别,羊水穿刺应选在妊娠________进行,为测定胎儿成熟度及疑母儿血型不合,应在________进行。
参考答案:16~20周;妊娠末期
Voluntary jobs can lead you to an understanding of ____ your talents are and ____ your life purpose lies,
which can start you on the path of new life. [ ]
A. what; how
B. how; what
C. what; where
D. where; what
没有咬合接触的是()
A.牙尖交错位
B.下颌姿势位
C.正中关系
D.前伸胎位
E.下颌后退接触位