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预防产后出血的措施，错误的是()B.
第一产程密切观察产程进展，防止产程延长，保证产妇基本需要 B.第二产程指导产妇正确使用腹压，适时适度作会阴侧切术，胎头、胎肩娩出要快 B.第二产程指导产妇正确使用腹压，适时适度作会阴侧切术，胎头、胎肩娩出要快
C.
对高危妊娠者如妊娠高血压疾病、肝炎、贫血、血液病等孕妇应提前住院
D.
胎盘未剥离前，不可过早牵拉脐带或按摩、挤压子宫
E.
胎肩娩出后立即肌注或静脉滴注催产素，以加强子宫收缩
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