货币制度的核心是（ ）。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='25263' and id < 2138529 and id<>'2138529' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='25263' and id > 2138529 and id<>'2138529' order by id asc limit 5