用显微镜观察人的口腔上皮细胞装片，请据下表回答问题： 组别 目镜 物镜 A组 5× 10×
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A的放大倍数：5×10═50倍，B的放大倍数：15×10═150倍，C的放大倍数：8×40═320倍，故C放大倍数最大；可见，C的放大倍数最大，看到的细胞数目最少；A的放大倍数最小，光线最亮，细胞体积最小． 调节光线强弱的结构是反光镜和遮光器，若视野中光线较暗，应选用大光圈和凹面镜，显微镜下物象模糊不清，这时可先转动细准焦螺旋，直到看到较为清晰的物像； 在显微镜中成的像是倒像的，如果发现物像位于视野的右下方，它实际上位于玻片标本的左上方，所以要移到中央，应向右下方移动．我们可以这样记忆：物像位于视野的哪个方向，就向哪个方向移动，就能移到视野的中央． 视野中能看到污点的位置只有目镜、物镜、与玻片标本，在实验中转动目镜，污点不动，转动转换器，调换物镜，污点还不动；说明污点可能在玻片标本上．故答案为：C；A；A；反光镜；遮光器；细准焦螺旋；右下方；目镜；凹面．
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