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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The advantage of CT is（）
A. high density resolution
B. high spatial resolution
C. low density resolution
D. low spatial resolution
E. low density resolution and high spatial resolution
Components of conventional CT include（）
A. computer system
B. laser camera
C. superconducting coil
D. RF generator
E. probe
The bone structure that is rarely seen on a chest radiograph is（）
A. lumbar vertebra
B. sternum
C. rib
D. clavicle
E. thoracic vertebra
The basic conditions for the formation of X-ray plain film include（）
A. X-ray has penetrating power
B. There is a difference in density or thickness of the penetrated tissue
C. X-ray fluorescence
D. Photosensitive effect of X-ray
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