Why do we start with low magnification and then switch to high magnification instead of using high magnification directly when using a microscope?
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为什麽于显微镜下观察物体 要先用低倍再换高倍 而不直接用高倍镜?
显微镜观测，低倍镜也一样 要一步一步来,先要用低倍数镜找到目标，调整物品位置，
如果都看不到 ,就谈不上用高倍镜了
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