公开市场业务的优点有（ ）。[2008年11月二级真题]

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SQL Error: select id,body,options from ***_enewstiku where sourceid='25261' and id < 2138448 and id<>'2138448' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='25261' and id > 2138448 and id<>'2138448' order by id asc limit 5