试题与答案

某同学利用“研究凸透镜成像”的实验装置,记录的某种透镜成像情况如下表: 次序蜡烛

题型:填空题

题目:

某同学利用“研究凸透镜成像”的实验装置,记录的某种透镜成像情况如下表:

次序蜡烛到透镜的距离

(u)/cm

像  的  性  质
倒立或正立放大或缩小
122倒立缩小
218倒立放大
38正立放大
由凸透镜成像规律,根据上表可推知该凸透镜的焦距应大于______cm,而小于______cm.

答案:

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Yet the survivors have to start somewhere. New homes can be built onto the stones, bricks and beams of old ones. Spring is coming and it is a good time to start again.

21.   A) injured     B) ruined           C) destroyed         D) damaged

22.   A) Altogether   B) Almost           C) Scarcely          D) Surely

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