She is trying to ______ the answer to the question.[ ]
A. find
B. look for
C. find out
答案:C
下面是未装配好的滑轮组,请在图中画出滑轮组的绕绳方法,使用滑轮组提高重物时最省力.
丹参、郁金的共同功效是()()