纵联保护传送给对端的信号利用的原理是（   ）。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69378' and id < 4491441 and id<>'4491441' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69378' and id > 4491441 and id<>'4491441' order by id asc limit 5