迷走神经兴奋使心率减慢，是由于窦房结细胞发生 下列哪种改变所致（      ）

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SQL Error: select id,body,options from ***_enewstiku where sourceid='25937' and id < 2179507 and id<>'2179507' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='25937' and id > 2179507 and id<>'2179507' order by id asc limit 5