金属表面电子溢出时能量来源可能为（）。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='32664' and id < 2597860 and id<>'2597860' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='32664' and id > 2597860 and id<>'2597860' order by id asc limit 5