室性期前收缩次数为哪项时可以诊断为 “频发性室性期前收缩”

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SQL Error: select id,body,options from ***_enewstiku where sourceid='31866' and id < 2547715 and id<>'2547715' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='31866' and id > 2547715 and id<>'2547715' order by id asc limit 5