引起右心室后负荷增加的疾病是()
A.主动脉瓣关闭不全
B.三尖瓣关闭不全
C.房间隔缺损
D.阻塞性肺气肿
E.动静脉瘘
参考答案:D
(2014·北京四中3月模考)It is well known that knowledge is________treasure house,but practice is________key to it.
A.a;the
B.the;the
C.a;/
D./;the
使馆有哪些主要职务?