如图是人体消化�吸循环和泌尿等系统生理活动示意图请据图回答1消化道中消化和吸收的主要部位是小肠小肠.物质a随血液循环首先到达心脏四 Template




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tomski如图是人体消化�吸循环和泌尿等系统生理活动示意图请据图回答1消化道中消化和吸收的主要部位是小肠小肠.物质a随血液循环首先到达心脏四 coloring