题目

I suddenly heard an elephant crying as though frightened. Looking down, I immediately recognized that something was wrong, and ran down to the edge of the near bank. There I saw Ma Shwe with her three-month-old calf struggling in the fast-rising water, and it was a life-and-death struggle. Her calf was floating and screaming with fear. Ma Shwe was as near to the far bank as she could get, holding her whole body against the rushing water, and keeping the calf pressed against her huge body. Every now and then the rushing water would sweep the calf away. There was a sudden rise in the wat下图是显微镜和小洁在显微镜下观察到的洋葱鳞片叶内表皮细胞的物像，请回答。(1)显微镜结构中的三镜指的是[ ] 、[ ] 和[ ] 。(2)若使物像甲向左上方移动至中央，应将装片向 移动。调整后，观察到物像乙，要使物像乙更加清晰，应调节[ ] 。