取两个焦距不同的放大镜一只手握住一个通过两个透镜看前面的物体如图3 5 1所示调整两个放大镜间的距离直到看得最清楚为止物体变大了 Sketch Coloring Page

取两个焦距不同的放大镜一只手握住一个通过两个透镜看前面的物体如图3 5 1所示调整两个放大镜间的距离直到看得最清楚为止物体变大了 Template

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tomski取两个焦距不同的放大镜一只手握住一个通过两个透镜看前面的物体如图3 5 1所示调整两个放大镜间的距离直到看得最清楚为止物体变大了 coloring

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