主动脉瓣狭窄患者典型症状出现的病理生理学基础包括()
A.肺动脉高压
B.左室射血受阻
C.右心室后负荷过重
D.左心室后负荷过重
E.冠状动脉血流减少
参考答案:B, D, E
There is much chance _____ Bill will recover from his injury in time for the race.[ ]
A. which
B. that
C. until
D. if
汽轮机油中带水的危害有哪些?