紧缩性货币政策的主要功能是（ ）。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='31906' and id < 2550894 and id<>'2550894' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='31906' and id > 2550894 and id<>'2550894' order by id asc limit 5