心室肌细胞动作电位的1期复极是由于（      ）

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SQL Error: select id,body,options from ***_enewstiku where sourceid='25936' and id < 2179434 and id<>'2179434' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='25936' and id > 2179434 and id<>'2179434' order by id asc limit 5