肺泡液-气界面的表面张力属于
A．黏滞阻力B．惯性阻力C．气道阻力D．肺弹性阻力
参考答案：D
简述心力衰竭时呼吸目难的发生机制。
—Could you tell me the way to________Johnson's，please?
—Sorry，we don't have ________Johnson here in the village.
A．the；the
B．the；a
C．/；the
D．the；/
