试题与答案

一个点光源垂直入射到被照面上所形成之照度,与光源距被照面距离的几次方成正比( )

题型:单项选择题

题目:

一个点光源垂直入射到被照面上所形成之照度,与光源距被照面距离的几次方成正比( )

A.一次方

B.二次方

C.三次方

D.四次方

答案:

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