隔离开关的作用有（  ）等几个方面。 

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69484' and id < 4500578 and id<>'4500578' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69484' and id > 4500578 and id<>'4500578' order by id asc limit 5