下列哪项不属于引起梗阻性分娩的原因（）.
A.胎儿先露异常
B.孕妇盆腔器官异常
C.多胎妊娠
D.胎盆不称
E.头盆不称
参考答案：C
Transformational generative linguists believe that every normal human being was born with an LAD. Here LAD is the short form of ______.
A. learner's acquisition device B. language acquisition deviceC. linguistic acting discussion D. long-term acquiring details
心力衰竭时应用扩血管药物的作用（）
A.降低心肌收缩力
B.使回心血量减少而降低心排血量
C.减慢心率使心肌氧耗减少
D.降低心脏排血阻抗而减少心肌氧耗
E.减少钠和水潴留使循环容量减少
