质量吸收系数表示γ光子与单位质量厚度的物质发生相互作用的概率，下列叙述正确的是

试卷相关题目

SQL Error: select id,body,options from ***_enewstiku where sourceid='29509' and id < 2400273 and id<>'2400273' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='29509' and id > 2400273 and id<>'2400273' order by id asc limit 5