变动成本是指在特定业务范围内，其总额随业务量的变动而正比例变动的成本。()

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SQL Error: select id,body,options from ***_enewstiku where sourceid='28009' and id < 2297049 and id<>'2297049' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='28009' and id > 2297049 and id<>'2297049' order by id asc limit 5