Ⅱ型呼吸衰竭是指A.PaO2<60 mmHg;PaCO2<50 mmHgB.PaO2<55 mmHg;PaCO2>50 mmHgC.PaO2<50 mmHg;PaCO

Ⅱ型呼吸衰竭是指

A．PaO2＜60 mmHg；PaCO2＜50 mmHg

B．PaO2＜55 mmHg；PaCO2＞50 mmHg

C．PaO2＜50 mmHg；PaCO2＞50 mmHg

D．PaO2＜60 mmHg；PaCO2＞50 mmHg

E．PaO2＞60 mmHg；PaCO2＜50 mmHg