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【单选题】
下列各种类型的子宫收缩乏力，正确的描述是( )A.
第二产程延长是指初产妇开全后，宫缩力弱，超过1小时尚未分娩
B.
继发宫缩乏力常见于头盆不称、中骨盆狭窄、持续性枕横位
C.
活跃期停滞是指开大3 5cm后，宫缩力弱，不继续扩张
D.
潜伏期延长是开大2～3cm到7～8cm的时间延长，宫缩力弱
E.
总产程超过26小时者，称为滞产
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