已知某单电源辐射性网络，AB 线路长为30KM,BC 线路长为40KM,单位长的阻抗是0.4 一段可靠系数为0.85,二段可靠系数为0.8,距离保护的二段整定值为(   )。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69437' and id < 4496826 and id<>'4496826' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69437' and id > 4496826 and id<>'4496826' order by id asc limit 5