刺激引起兴奋的基本条件是使跨膜电位达到（      ）

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SQL Error: select id,body,options from ***_enewstiku where sourceid='25932' and id < 2179288 and id<>'2179288' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='25932' and id > 2179288 and id<>'2179288' order by id asc limit 5