FFR中的中心用户CCU和边缘用户CEU是通过测量的（    ）与预先设定的门限值进行比较或服务小区和干扰小区的路损比值来区分：[1分]

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='58020' and id < 3666864 and id<>'3666864' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='58020' and id > 3666864 and id<>'3666864' order by id asc limit 5