I don't know the way, and she doesn't know, ______.[ ]
A. too
B. also
C. no
D. either
答案:D
呼吸衰竭时发生二氧化碳潴留的主要机制是由于()
A.通气/血流比例失调
B.弥散障碍
C.肺组织通气不足
D.动静脉分流
E.无效腔通气
下列等式成立的是()
A.A
B.B
C.C
D.D