慢性肺源性心脏病降低肺动脉高压的首选治疗是（）
A.支气管舒张剂
B.氧疗
C.呼吸兴奋剂
D.利尿剂
E.强心剂
参考答案：B
-- Have you been to the Great Wall?
-- Perhaps not in my memory. _______, it might have been during my early childhood.
A．If any
B．If ever
C．If once
D．If not
既可预防也可迅速终止心绞痛发作的药物
A．硝酸甘油B．普萘洛尔C．普罗帕酮D．硝苯地平E．维拉帕米
