根据IMF协定第八条款的规定，货币可兑换概念主要是指（ ）。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='27090' and id < 2246666 and id<>'2246666' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='27090' and id > 2246666 and id<>'2246666' order by id asc limit 5