[本科]纵联电流差动保护通道中传送的是（  ）信号。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69478' and id < 4500885 and id<>'4500885' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69478' and id > 4500885 and id<>'4500885' order by id asc limit 5