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观察水中小生物时显微镜的光圈应调大还是调小？
观察水中小生物时，先用低倍物镜观察，若必要时再换高倍物镜观察
显微镜的光圈调大调小就要看你是用低倍物镜观察，还是用高倍物镜观察
如果以高倍物镜观察，视野光线太暗时，可将光圈调大
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