正确答案: B

250倍

题目：一个传递细胞用目镜10×，物镜25×的倍数观察，细胞的放大倍数是多少?( )

解析：B

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举一反三的答案和解析：

[单选题]24 As a child, Jack studied in a village school，——is named after his grandfather．

which

[单选题]

needs

[单选题]松、杨分枝方式属于( )。

单轴分枝