神经细胞在接受一次阈上刺激后，其兴奋性的变 化是（      ）

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SQL Error: select id,body,options from ***_enewstiku where sourceid='25933' and id < 2179309 and id<>'2179309' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='25933' and id > 2179309 and id<>'2179309' order by id asc limit 5