值是指酶促反应速率达到其最大速率（ ）时的底物浓度。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='30921' and id < 2488449 and id<>'2488449' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='30921' and id > 2488449 and id<>'2488449' order by id asc limit 5