[本科]闭锁式方向纵联保护，保护停信需带一短延时，这是为了（  ）。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69478' and id < 4500874 and id<>'4500874' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69478' and id > 4500874 and id<>'4500874' order by id asc limit 5