读书写字姿势要端正,眼睛与书本的距离应保持多少厘米左右?
读书写字姿势要端正,眼睛与书本的距离应保持多少厘米左右?
物理人气：711 ℃时间：2020-03-30 22:39:47
优质解答
30厘米
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