单选题：初产妇，23岁。妊娠39周。BP130/80mmHg，枕右前位，估计胎儿体重2800g。临产后l0小时，宫缩逐渐减弱，胎

题目内容：
初产妇，23岁。妊娠39周。BP130/80mmHg，枕右前位，估计胎儿体重2800g。临产后l0小时，宫缩逐渐减弱，胎膜已破，宫口开大7Cm，S+2．胎心140次/分。此时恰当的处理措施是 A．肌内注射缩宫素
B．静脉滴注缩宫素
C．静脉注射麦角新碱
D．立即行剖宫产术
E．静脉注射地西泮
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答案解析：

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