如图是人体细胞与外界环境进行物质交换的过程图解请据图回答下列问题.1a表示�吸系统b表示消化系统c表示泌尿系统.2图中和体内细胞 Template




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tomski如图是人体细胞与外界环境进行物质交换的过程图解请据图回答下列问题.1a表示�吸系统b表示消化系统c表示泌尿系统.2图中和体内细胞 coloring