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【单选题】
关于大动脉结构的描述,哪不正确的?
A.
内膜有内皮和内皮下层
B.
内皮细胞中富含W-P小体
C.
中膜有40-70层弹性膜
D.
弹性膜之间有平滑肌和弹性纤维
E.
外膜由疏松结缔组织和内皮共同组成
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