试题与答案

一架望远镜筒长40cm,物镜焦距36cm,其放大本领为()。A.-9 B.9 C.-

题型:单项选择题

题目:

一架望远镜筒长40cm,物镜焦距36cm,其放大本领为()。

A.-9

B.9

C.-10

D.8

答案:

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