中间继电器的作用是()。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69548' and id < 4507041 and id<>'4507041' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69548' and id > 4507041 and id<>'4507041' order by id asc limit 5