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Why do you need to observe objects under a low-power objective lens before switching to a high-power objective lens?

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为何在显微镜下观察物体时需以低倍镜再换高倍镜?
因为一般高倍率显微镜的视野会比低倍率的视野小很多

为了确定能够找到你的目标物

所以需要先用低倍率光学显微镜锁定你要找的东西

再用高倍率观察之

先用低倍率的宽广视野找到需要仔细观察的重点,放在中间,才能换高倍率。

如果你直接用高倍率,非常难找。

你会多花很多冤枉时间。

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