令FC=固定成本，Q=产量，MC=边际成本，TC=总成本，VC=可变成本，则平均成本等于(    )

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='1781' and id < 114525 and id<>'114525' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='1781' and id > 114525 and id<>'114525' order by id asc limit 5