C02在血液中运输的主要形式是（      ）

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SQL Error: select id,body,options from ***_enewstiku where sourceid='25939' and id < 2179597 and id<>'2179597' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='25939' and id > 2179597 and id<>'2179597' order by id asc limit 5