下列哪期接受心室额外刺激后，可出现期前收缩和 代偿间歇（      ）

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SQL Error: select id,body,options from ***_enewstiku where sourceid='25935' and id < 2179397 and id<>'2179397' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='25935' and id > 2179397 and id<>'2179397' order by id asc limit 5