题目内容

I’m going to take a break from studying. I’m________(too/enough) tired to concentrate.

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I’m worried that we don’t have ________ (enough/such) food for our dinner party tonight

软弱下下卧层

(2)简述基础埋深的要求。

波长为546nm的绿色平行光垂直入射于宽0.437mm的单缝,缝后放置一焦距为40cm的透镜,透镜焦面上衍射条纹中央明纹宽度为()

A. 1mm
B. 1cm
C. 0.5mm
D. 0.5cm

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