在心肌的前负荷和收缩能力不变的情况下,增加后负荷可使()
A.等容收缩期延长
B.射血期延长
C.等容舒张期延长
D.心室充盈期延长
E.每搏输出量增加
参考答案:A
属于缺陷病毒的是()
A.甲肝病毒
B.乙肝病毒
C.丙肝病毒
D.丁肝病毒
E.戊肝病毒
--- Excuse me! Could you tell me ____________?
--- Sure. Go straight and turn right. It’s down Bridge Street on your left.
A.where can I find a pay phone
B.where I can find a pay phone
C.when can I find a pay phone
D.when I can find a pay phone