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
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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
Which of the following can accurately diagnose early pregnancy（）
A. ultrasound shows pregnancy sac echo in the uterus
B. Frequent urination
C. Uterine enlargement and cervical congestion shows purple-blue
D. Urine Pregnancy Test（）
Where does the uterine artery originate（）
A. the anterior trunk of the internal iliac artery
B. external iliac artery
C. abdominal aorta
D. renal artery
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