IPSP是由于突触后膜对哪种离子的通透性增加（      ）

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SQL Error: select id,body,options from ***_enewstiku where sourceid='25946' and id < 2179960 and id<>'2179960' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='25946' and id > 2179960 and id<>'2179960' order by id asc limit 5