下列函数：①y= ；②y=3x-2；③y=x 4+x 2；④y= ，其中幂函数的个数为

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='19254' and id < 1663739 and id<>'1663739' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='19254' and id > 1663739 and id<>'1663739' order by id asc limit 5