此时的处理原则应是
&nBsp; &nBsp; A.肌内注射缩宫素
&nBsp; &nBsp; B.静脉滴注麦角新碱
&nBsp; &nBsp; C.肌内注射哌替啶
&nBsp; &nBsp; D.人工破膜
&nBsp; &nBsp; E.立即行剖宫产术