下列行为中属于单方民事法律行为的有（ ）。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='31296' and id < 2511039 and id<>'2511039' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='31296' and id > 2511039 and id<>'2511039' order by id asc limit 5