用滑轮组拉出陷入泥中的汽车.在图中画出最省力的绳子绕法.
只有一个动滑轮,要求最省力,绳子先系在动滑轮的固定挂钩上,然后绕过左边的定滑轮,再绕过动滑轮.
故答案为:
This photo of mine was taken__________ stood the famous high tower.
A.which
B.in which
C.where
D.there
绿脓杆菌在生长繁殖过程中能产()色素.