相对于深部X射线，60钴射线对软组织的吸收剂量较高，是因为

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SQL Error: select id,body,options from ***_enewstiku where sourceid='29521' and id < 2401281 and id<>'2401281' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='29521' and id > 2401281 and id<>'2401281' order by id asc limit 5