下列药品中哪一个属于β受体阻滞剂？（ ）

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SQL Error: select id,body,options from ***_enewstiku where sourceid='30940' and id < 2490533 and id<>'2490533' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='30940' and id > 2490533 and id<>'2490533' order by id asc limit 5