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【多选题】
关于脊髓的结构,以下正确的是A.
由灰质和白质组成，灰质在内，白质在外
B.
人为分为31个脊髓阶段，与31对脊神经相连
C.
脊髓的长度比椎管的长度短
D.
白质内有上行传导下行传导束
E.
脊髓灰质全长均有侧角
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A.
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A.
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B.
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C.
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D.
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A.
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B.
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C.
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