下列哪项不是苏合香的功能（）
A.开窍
B.醒神
C.解毒
D.辟秽
E.止痛
参考答案：C
核子密度仪采用直接透射法测定路面结构层压实度时，孔深应略小于结构层厚度。
Find ways to praise your children often, _____ you'll find they will open their hearts to you. [ ]
A. till
B. or
C. and
D. but
