无发绀而肺血少者见于()
A.房间隔缺损(继发孔型)
B.室间隔缺损
C.动脉导管未闭
D.肺动脉瓣狭窄
E.法洛四联症
参考答案:D
—I'm not sure _________there are living things on the planets or not.
—Even scientists aren't sure about it.[ ]
A. whether
B. where
C. why
D. what
压力型手控定量气雾剂(MDI)给药后,药物在下呼吸道和肺泡的沉积率为()
A.30%
B.5%
C.20%
D.40%
E.9%~11%