在治疗心功能不全时,应用洋地黄的临床意义在于()
A.维持有效的心排血量
B.减慢心率和延缓传导
C.减少心肌耗氧量
D.改善内脏淤血
E.利尿
参考答案:A
I'm so glad to see you back, Lucy. How long _______ at your grandma's?[ ]
A. had you stayed
B. did you stay
C. have you stayed
D. would you stay
球员只要在极阵內拾球即可压球触地。