美元等同于黄金，实行可调整的同定汇率制度，是（ ）的特征。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='25442' and id < 2143601 and id<>'2143601' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='25442' and id > 2143601 and id<>'2143601' order by id asc limit 5