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
Which of the following is a major characteristic of meiosis I（）
A. Splitting of the centromere
B. Pairing of homologous chromosomes
C. Reducing the amount of DNA to IN
D. Achieving the diploid number of chromosomes
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