心室期前牧缩之后出现代偿间歇的原 因是（）

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SQL Error: select id,body,options from ***_enewstiku where sourceid='28671' and id < 2339916 and id<>'2339916' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='28671' and id > 2339916 and id<>'2339916' order by id asc limit 5