心的正常自动节律性兴奋的起搏点是（ ）。

试卷相关题目

SQL Error: select id,body,options from ***_enewstiku where sourceid='30921' and id < 2488420 and id<>'2488420' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='30921' and id > 2488420 and id<>'2488420' order by id asc limit 5