获得了“客体永久性”概念是处于（ ）的幼儿思维发展的最大成就之一。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='26188' and id < 2193934 and id<>'2193934' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='26188' and id > 2193934 and id<>'2193934' order by id asc limit 5