[单选题]闭锁式纵联保护跳闸的必要条件是(  )。(每题1分)（0.5）

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69425' and id < 4495544 and id<>'4495544' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69425' and id > 4495544 and id<>'4495544' order by id asc limit 5