当生产函数Q=f(L，K)的APL为正且递减时，MPL可以是（ ）。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='31437' and id < 2520146 and id<>'2520146' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='31437' and id > 2520146 and id<>'2520146' order by id asc limit 5