18.1图甲画出了通过透镜前后光线的方�请 在虚线框内画出相应的透镜 2在图乙中一个站在地面上的人用较小的力 通过�轮组将重物提 Template




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tomski18.1图甲画出了通过透镜前后光线的方�请 在虚线框内画出相应的透镜 2在图乙中一个站在地面上的人用较小的力 coloring