经营者提供商品或者服务应当明码标价，这种经营者义务属于

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SQL Error: select id,body,options from ***_enewstiku where sourceid='29658' and id < 2409776 and id<>'2409776' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='29658' and id > 2409776 and id<>'2409776' order by id asc limit 5