[本科]线路分相电流差动保护采用（  ）通道最优。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69478' and id < 4500884 and id<>'4500884' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69478' and id > 4500884 and id<>'4500884' order by id asc limit 5