某药物单室模型静脉注射经4个半衰期后， 其体内药量为原来的（  ）。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='24975' and id < 2127556 and id<>'2127556' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='24975' and id > 2127556 and id<>'2127556' order by id asc limit 5