单选题：知识点：产后出血 初产妇，25岁。因第二产程延长，行产钳助产，产后阴道流血约800ml.诊断为子宫收缩乏力所致，其主要临

题目内容：
知识点：产后出血
初产妇，25岁。因第二产程延长，行产钳助产，产后阴道流血约800ml.诊断为子宫收缩乏力所致，其主要临床表现应是 A．胎盘剥离延缓而出血
B．胎盘娩出后出血无血块
C．胎盘未娩出时出血不止
D．胎儿娩出后立即流血不止
E．胎盘娩出后阵发性出血时多时少

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