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A.神經(jīng)纖維
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C.神經(jīng)元
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B.分有髓神經(jīng)纖維和無髓神經(jīng)纖維兩種
C.有髓神經(jīng)纖維有髓鞘和郎飛結(jié)
D.無髓神經(jīng)纖維無髓鞘和郎飛結(jié)
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