图所示，特性曲线a与b所表征的元件分别应为（）。 

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SQL Error: select id,body,options from ***_enewstiku where sourceid='32670' and id < 2598664 and id<>'2598664' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='32670' and id > 2598664 and id<>'2598664' order by id asc limit 5