可以避免肝首过效应的片剂类型是（    ）

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SQL Error: select id,body,options from ***_enewstiku where sourceid='27509' and id < 2269846 and id<>'2269846' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='27509' and id > 2269846 and id<>'2269846' order by id asc limit 5