如图所示，某重力式挡土墙高4m，ε= 10°，β=5°。墙后回填砂土，c=0，=30

试述上睑提肌缩短术矫正上睑下垂的术后并发症及处理。

具有祛风湿，补肝肾，强筋骨，安胎作用的药物是( )

A．羌活
B．独活
C．木瓜
D．防己
E．五加皮

Never form the habit of smoking because it ______ human beings.

A．does harm with

B．is harmful to

C．is harm for

D．does harmful to

John insisted that he______everything he could to make sure of Mary's happiness.

A．do

B．does

C．did

D．must do

具有祛痰止咳功效的药物是（）。

A.牵牛子

B.芫花

C.商陆

D.甘遂

E.大戟