发生康普顿效应时，如果散射角为90°则散射光子的能量最大不超过

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SQL Error: select id,body,options from ***_enewstiku where sourceid='29509' and id < 2400266 and id<>'2400266' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='29509' and id > 2400266 and id<>'2400266' order by id asc limit 5