电子线很容易散射，导致50%剂量线的扩散角呈现一定的特征，下列不正确的是

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SQL Error: select id,body,options from ***_enewstiku where sourceid='29410' and id < 2394946 and id<>'2394946' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='29410' and id > 2394946 and id<>'2394946' order by id asc limit 5