转动粗准焦螺旋，使镜筒缓缓下降，这时眼睛应该看着 A．目镜_爱下问搜题

搜题请搜索小程序“爱下问搜题”

问题选择题

转动粗准焦螺旋，使镜筒缓缓下降，这时眼睛应该看着

A．目镜

B．反光镜

C．转换器

D．物镜

答案

答案：D

镜筒下降时，为了以防物镜装片，损坏镜头，所以眼睛注视着物镜。

解答题

不能化成有限小数．______．

选择题

______ he was ill I was expected to take his place greatly surpried me for I didn’t have much work experience.

A．If

B．If that

C．That

D．That if