洋地黄的正性肌力作用与哪种药理作用有关()
A.抑制钠钾ATP酶
B.抑制心脏传导系统
C.兴奋迷走神经
D.抑制交感神经
E.降低心肌细胞内钙离子浓度
参考答案:A
He accidentally ____ he had quarreled with his wife and that he had not been home for a couple of weeks. [ ]
A. let out
B. took care
C. leave out
D. made out
汽车转向系统可按转向的能源不同,分为()和()。