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[291 Howes C，Hamilton C．The chan舀ng experience of child care：Changes  in teachers  and in teacher—‘child re— lationships  and children’s  social competence witIl peers．
Early Childhood Research Quarterly．1993：8：15—32
【30】NICHD   Early Child Care Research Network． Child outcomes when child—-care classrooms meet recom-- mended guidelines  for quality．American Journal of Pub— lic Heahh．1999．89：1072—1077
 

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