下列选项中，          是设备的MAC地址。（ ）

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SQL Error: select id,body,options from ***_enewstiku where sourceid='27171' and id < 2251209 and id<>'2251209' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='27171' and id > 2251209 and id<>'2251209' order by id asc limit 5