用6MV X线与15MV X线混合照射，可以产生相同效果的能量范围是

试卷相关题目

SQL Error: select id,body,options from ***_enewstiku where sourceid='29410' and id < 2394932 and id<>'2394932' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='29410' and id > 2394932 and id<>'2394932' order by id asc limit 5