单选题：关于持续性枕横位及枕后位哪项正确（　　）

题目分类：临床执业助理医师
题目类型：单选题
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题目内容：

关于持续性枕横位及枕后位哪项正确（　　） A．骨盆入口狭窄常是引起持续性枕横位的原因
B．枕横位及枕后位时，产妇较早施加腹压可加速产程进展
C．较早施加腹压，可以避免宫颈水肿
D．枕横位时经阴道检查除矢状缝及大小囟门外，可以胎儿耳廓方向来确定胎位
E．胎头双顶径降至坐骨棘以下，手转胎头困难时可行剖宫手术

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