A.核苷酸序列
B.β折叠
C.超螺旋
D.双螺旋
第3题
A、all cervical vertebrae have vertebral body and articular process
B、the first cervical vertebra has no transverse foramen
C、the end of the spinous process of the cervical vertebrae bifurcated entirely
D、the articular facets are relatively horizontal
E、the first cervical vertebra is called axis
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