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多选题
About the spinal cord, which of the following descriptions are correct?（ ）
A
It occupies the whole vertebral canal.
B
It presents the thoracic enlargement and lumbar enlargement.
C
It has 30 segments: 7 cervical segments, 12 thoracic segments, 5 lumbar segments, 5 sacral segments,
D
It is continuous with the brain stem.
E
It terminates as conus medullaris (脊髓圆锥).
答案解析
正确答案：DE
