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显微镜为何先用低倍再换高倍而不直接用高倍镜

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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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