对成人来讲，下列属于必需氨基酸的是（ ）。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='31065' and id < 2498666 and id<>'2498666' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='31065' and id > 2498666 and id<>'2498666' order by id asc limit 5