皮皮学，免费搜题
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【单选题】
用显微镜观察洋葱表皮细胞，第一次使用的目镜为10，物镜为10，第二次使用的目镜为5，物镜为10，第二次在视野中看到的物象与第一次看到的物象相比（ ）
B.
细胞大小是原来的一半，细胞的数量增多 B.细胞大小是原来的2倍，细胞的数量增多
C.
细胞大小是原来的一半，细胞的数量减少 B.细胞大小是原来的2倍，细胞的数量减少
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