如图是人体与外部环境之间的物质交换模式图数字1 8表示人体的某些结构字母a f代表人体内的某些物质请据图回答 1a进入血液循环的 Template




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tomski如图是人体与外部环境之间的物质交换模式图数字1 8表示人体的某些结构字母a f代表人体内的某些物质请据图回答 coloring