纵联差动保护无法适用于长输电线路的原因是（   ）。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69518' and id < 4503734 and id<>'4503734' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69518' and id > 4503734 and id<>'4503734' order by id asc limit 5