马钱子须炮制后入药,其炮制的目的是()。
A.提高疗效
B.改变药性
C.减缓毒性
D.便于贮藏
E.便于制剂
参考答案:C
—Are you free after school?
—Sorry.I've planned to treat a friend of mine to dinner________for his help.[ ]
A. in addition
B. in turn
C. in return
D. in total
压力对液体和气体的粘度都有影响。