下列哪种片剂用药后可缓馒释药，维持 疗效几周、几个月甚至几年（    ）

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SQL Error: select id,body,options from ***_enewstiku where sourceid='27486' and id < 2270798 and id<>'2270798' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='27486' and id > 2270798 and id<>'2270798' order by id asc limit 5