脂酸合成所需的氢由下列哪种递氢体提供（    ）

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SQL Error: select id,body,options from ***_enewstiku where sourceid='27520' and id < 2271173 and id<>'2271173' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='27520' and id > 2271173 and id<>'2271173' order by id asc limit 5