如图小明在做“探究凸透镜成像规律 的实验时所用凸透镜焦距为15cm1在实验时应先调节烛焰凸透镜光屏的中心大致在 其目的是为了 Template




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tomski如图小明在做“探究凸透镜成像规律 的实验时所用凸透镜焦距为15cm1在实验时应先调节烛焰凸透镜光屏的中心大致在 其目的是为了 coloring