左心衰竭常表现为（）.

A.PaO₂65mmHg，PaCO₂52mmHg
B.PaO₂62mmHg，PaCO₂50mmHg
C.PaO₂52mmHg，PaCO₂59mmHg
D.PaO₂55mmHg，PaCO₂30mmHg
E.PaO₂64mmHg，PaCO₂52mmHg

A.PaO₂>50mmHg，PaCO₂<50mmHg
B.PaO₂>60mmHg，PaCO₂>50mmHg
C.PaO₂>55mmHg，PaCO₂<30mmHg
D.PaO₂<60mmHg，PaCO₂<50mmHg
E.PaO₂<60mmHg，PaCO₂<40mmHg

A.气管阻塞狭窄
B.局部肺间质纤维化
C.严重肺结核
D.昏迷合并肺部重症感染
E.慢性阻塞性肺疾病