如果某物质在肾动脉中有一定浓度，而在肾静脉中 为零，其血浆清除率（      ）

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SQL Error: select id,body,options from ***_enewstiku where sourceid='25944' and id < 2179860 and id<>'2179860' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='25944' and id > 2179860 and id<>'2179860' order by id asc limit 5