Necessary conditions for fertilized egg implantation are（）
A. pregnant women secrete a sufficient amount of progesterone
B. transparent band disappears
C. blastocyst and endometrium develop synchronously and function coordinately
D. blastocyst trophoblast differentiates into syncytiotrophoblast
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The function of the placenta includes（）
A. Substance Exchange Function
B. Synthetic function
C. Defense function
D. Immune function
Fetal head engagement refers to（）
A. Biparietal diameter enters the pelvic entrance plane
Biparietal diameter reaches the plane of ischial spine
C. Occipital bone enters the pelvic entrance plane
D. Parietal bone enters the pelvic entrance plane
Placenta functions include（）
A. defense function
B. immune function
C. substance exchange function
D. synthesis function
Fertilization egg implantation requires（）
A. Simultaneous development and functional coordination of the blastocyst and endometrium
B. Zonal pellucida disappears
C. Blastocyst and trophocyte differentiate into syncytiotrophoblast
D. Pregnant women endocrine sufficient amount of progesterone
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