Which of the following components plays the most active role in invading the endometrium during blastocyst implantation（）
A. Epiblaslt
B. Syncytiotrophoblast
C. Hypoblast
D. Extraembryonic somatic mesoderm
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Which principle of spiral CT scanning is correct（）
A. The tube rotates and the bed moves simultaneously
B. The tube rotates and the bed is stationary
C. The tube is fixed and the bed moves continuously
D. The tube rotates first and then the bed moves
E. The tube and the bed are both fixed
Which of the following does not belong to new CT technology（）
A. HRCT
B. CTA
C. Virtual endoscope
D. Volume rendering
E. MIP
MR is not sensitive to which of the following tissue（）
A. Bone
Brain tissue
C. Water
D. Soft tissue
Which of the following chromosome compositions in a sperm normally results in the production of a genetic female if fertilization occurs（）
A. 23 homologous pairs of chromosomes
B. 23 autosomes plus an X chromosome
C. 22 autosomes plus a Y chromosome
D. 22 autosomes plus an X chromosome
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