以下哪项不属于排痰训练（）
A.体位引流
B.胸部叩击
C.震颤
D.直接咳嗽
E.前倾站立
参考答案：E
29. On March 12, the students were planting trees ____ the classroom.
A．in the back of
B．at the back of
C．to the back of
D．on the back of
穿山甲、王不留行、当归等中药对结石的药理作用是使之
A．缩小B．软化C．变脆D．溶解
