三羧酸循环中的关键酶有（    ）

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SQL Error: select id,body,options from ***_enewstiku where sourceid='27522' and id < 2271067 and id<>'2271067' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='27522' and id > 2271067 and id<>'2271067' order by id asc limit 5