合并单元在外部时钟源丢失后，应保证守时误差在l。min内应小于（ ）畔。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='29463' and id < 2399308 and id<>'2399308' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='29463' and id > 2399308 and id<>'2399308' order by id asc limit 5