下列哪些是非竞争性拮抗剂的特性（    ）

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SQL Error: select id,body,options from ***_enewstiku where sourceid='27504' and id < 2270030 and id<>'2270030' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='27504' and id > 2270030 and id<>'2270030' order by id asc limit 5