痰量较多、排痰困难、无力咳嗽的病人（）
A.体位引流
B.湿化呼吸道
C.拍背与胸壁震荡
D.机械吸痰
E.指导病人有效咳嗽、咳痰的方法
参考答案：D
The growing speed of a plant is influenced by a number of factors, ____ are beyond our control. [ ]
A. most of them
B. most of which
C. most of what
D. most of that
患者的道德权利
