如果测得某能量的高能电子束PDD曲线，则电子束的模体表面平均能量是

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SQL Error: select id,body,options from ***_enewstiku where sourceid='29509' and id < 2400279 and id<>'2400279' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='29509' and id > 2400279 and id<>'2400279' order by id asc limit 5