有关女性生殖系统自然防御功能的描述,有误的一项是
A.两侧大阴唇自然合拢遮掩阴道口、尿道口
B.阴道前后壁紧贴,可防止外界的污染
C.子宫颈分泌的黏液形成“黏液栓”,堵塞子宫颈管
D.子宫颈阴道部表面覆以单层鳞状上皮,具有较强的抗感染能力
正确答案是D
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