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对1991~1997年全校在校生视力低下状况进行了分析,结果见表1。小学生视力低下状况7年比较@王雪萍$山东省沂源县实验小学!256100
The situation of poor eyesight in the whole school from 1991 to 1997 was analyzed. The results are shown in Table 1. 7 years of poor vision of primary school students compared @ Wang Xueping Experimental Primary School, Yiyuan County, Shandong Province 256100