（多选）下列工具属于省力杠杆的有（ ）。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='31897' and id < 2550068 and id<>'2550068' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='31897' and id > 2550068 and id<>'2550068' order by id asc limit 5