Ⅰ型呼吸衰竭是指（）
A.中枢性呼吸衰竭
B.通气与换气功能衰竭
C.呼吸道梗阻引起的呼衰
D.通气功能衰竭
E.换气功能衰竭
参考答案：E
Helen had to shout ______above the sound of the music .
A．making herself hear
B．to make herself hear
C．making herself heard
D．to make herself heard
试述肝肾综合征的发病机制。
