下列能决定或影响供给的因素有（ ）。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='31907' and id < 2550949 and id<>'2550949' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='31907' and id > 2550949 and id<>'2550949' order by id asc limit 5