对于阵发性房扑抗心律失常药物首选（）
A.胺碘酮
B.钙离子拮抗剂
C.普罗帕酮
D.洋地黄
E.β-受体阻滞剂
参考答案：D
25. As soon as I got home, my father asked ______ with me.
A．what the matter was
B．how the matter was
C．how was the matter
D．what was the matter
一个学生管理信息系统应当属于（）。
A.DBAS
B.DBMS
C.DBS
D.DB
