下列哪项引起右心室后负荷增加()
A.主动脉瓣关闭不全
B.房间隔缺损
C.慢性阻塞性肺气肿
D.三尖瓣关闭不全
E.室间隔缺损
参考答案:C
—— I cannot see the picture well from here.
---- _____.
A.Neither can t I
B.Neither I can
C.I can't neither
D.Neither can I
法国直到20世纪初仍存在着()轨学制。