Number of children in the different knower-levels at the two time points by age group.
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https://figshare.com/articles/dataset/_Number_of_children_in_the_different_knower_levels_at_the_two_time_points_by_age_group_/964215
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资源简介：
Number of children in the different knower-levels at the two time points by age group.
创建时间：
2014-03-17
