超额准备金作为货币政策中介指标的缺陷是（ ）。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='31437' and id < 2520208 and id<>'2520208' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='31437' and id > 2520208 and id<>'2520208' order by id asc limit 5